Registering references is required for Cited-by participants but we encourage you to include references (citation lists, bibliographies) with all content you register. References can be included when your content is initially registered, submitted post-registration as a resource deposit, or submitted through our Simple Text Query form. You are also encouraged to distribute your references as part of your metadata record.
Reference content registration XML
When depositing references, we recommend that the individual citations be marked up according to our deposit schema, for example:
<citation key="ref1">
<journal_title>Current Opinion in Oncology</journal_title>
<author>Chauncey</author>
<volume>13</volume>
<first_page>21</first_page>
<cYear>2001</cYear>
</citation>
Marking up each element allows us to be very precise when identifying potential matches with registered DOIs.
If you know the DOIs of individual citations, these should be included. We'll use the metadata deposited for the DOI when generating cited-by matches.
<citation key="ref2">
<doi>10.5555/small_md_0001</doi>
</citation>
References may also be included as an unstructured citation. This option is not as precise as including an already-matched DOI or marking up a citation into individual elements.
<citation key="ref=3">
<unstructured_citation>Clow GD, McKay CP, Simmons Jr. GM, and Wharton RA, Jr. 1988. Climatological observations and predicted sublimation rates at Lake Hoare, Antarctica. Journal of Climate 1:715-728.</unstructured_citation>
</citation>
Current elements for citation deposits
The current elements for citation tagging are :
<issn>: ISSN of a series (print or electronic)
<journal_title>
<author>: first author of an article or other publication
<volume>: volume number (journal or book set)
<issue>: journal issue
<first_page>
<cYear>: year of publication
<article_title>: journal article, conference paper, or book chapter title
<isbn>
<series_title>: title of a book or conference series
<volume_title>: book or conference proceeding title
<edition_number>
<article_title>
<std_designator>
<standards_body_name>
<standards_body_acronym>
<component_number>: the chapter, section, part, etc. number for a content item in a book.
<unstructured_citation>: citations for which no structured data is available. Crossref's ability to process unstructured citations is limited (more info)
<doi>: include the DOI wherever possible
Review schema documentation for the <citation> element for more information.
All citation elements are optional but we ask you to submit as much information as is known to help us match your citations to DOIs.
Journal citations should include either <issn> or <journal_title> or both. <journal_title> only is preferred over <issn> only. In addition the first author (<author>) and <first_page number> should be submitted. <first_page> number is preferred, but for those citations that are "in press", the author should be submitted.
When submitting a book or conference citation, you should include an <isbn>, <series_title>, <volume_title>, or any combination of these three elements as may be available.
A citation for a standard must include a standard designator (<std_designator>) as well as the name and acronym of a standards body (<standards_body_name>, <standards_body_acronym>). These elements are required for identifying a citation of a standard.
Examples
Metadata deposit example
References may be included with a metadata deposit. The references are included within the <citation_list> element. Review the sample below or download an XML file.
<doi_batch xmlns="http://www.crossref.org/schema/4.3.7" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="4.3.7" xsi:schemaLocation="http://www.crossref.org/schema/4.3.7 http://www.crossref.org/schema/deposit/crossref4.3.7.xsd">
<head>
<doi_batch_id>1dbb27d1030c6c9d9d-7ff0</doi_batch_id>
<timestamp>200504260247</timestamp>
<depositor>
<depositor_name>your name</depositor_name>
<email_address>your@email.com</email_address>
</depositor>
<registrant>WEB-FORM</registrant>
</head>
<body>
<journal>
<journal_metadata>
<full_title>Test Publication</full_title>
<abbrev_title>TP</abbrev_title>
<issn media_type="print">12345678</issn>
</journal_metadata>
<journal_issue>
<publication_date media_type="print">
<month>12</month>
<day>1</day>
<year>2005</year>
</publication_date>
<journal_volume>
<volume>12</volume>
</journal_volume>
<issue>1</issue>
</journal_issue>
<!--This is the article's metadata-->
<journal_article publication_type="full_text">
<titles>
<title>Article 12292005 9:32</title>
</titles>
<contributors>
<person_name sequence="first" contributor_role="author">
<given_name>Bob</given_name>
<surname>Surname</surname>
<ORCID>http://orcid.org/0000-0002-4011-3590</ORCID>
</person_name>
</contributors>
<publication_date media_type="print">
<month>12</month>
<day>1</day>
<year>2004</year>
</publication_date>
<pages>
<first_page>100</first_page>
<last_page>200</last_page>
</pages>
<doi_data>
<doi>10.50505/test_20051229930</doi>
<resource>http://www.crossref.org/</resource>
</doi_data>
<!--the list of references cited in the above article-->
<citation_list>
<citation key="ref1">
<journal_title>Current Opinion in Oncology</journal_title>
<author>Chauncey</author>
<volume>13</volume>
<first_page>21</first_page>
<cYear>2001</cYear>
</citation>
<citation key="ref2">
<doi>10.5555/small_md_0001</doi>
</citation>
<citation key="ref=3">
<unstructured_citation>Clow GD, McKay CP, Simmons Jr. GM, and Wharton RA, Jr. 1988. Climatological observations and predicted sublimation rates at Lake Hoare, Antarctica. Journal of Climate 1:715-728.</unstructured_citation>
</citation>
</citation_list>
</journal_article>
</journal>
</body>
</doi_batch>
Resource deposit example
References may be added to an existing metadata record using a resource deposit. Review the sample below or download an XML file.
<doi_batch xmlns="http://www.crossref.org/doi_resources_schema/4.3.6" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="4.3.6" xsi:schemaLocation="http://www.crossref.org/doi_resources_schema/4.3.6 http://www.crossref.org/schema/deposit/doi_resources4.3.6.xsd">
<head>
<doi_batch_id>123456</doi_batch_id>
<depositor>
<depositor_name>your name</depositor_name>
<email_address>support@crossref.org</email_address>
</depositor>
</head>
<body>
<doi_citations>
<!--The DOI of the article that contains the citations -->
<doi>10.5555/small_md_0001</doi>
<!--The list of references cited in the above article -->
<citation_list>
<citation key="ref1">
<journal_title>Current Opinion in Oncology</journal_title>
<author>Chauncey</author>
<volume>13</volume>
<first_page>21</first_page>
<cYear>2001</cYear>
</citation>
<citation key="ref2">
<doi>10.5555/small_md_0001</doi>
</citation>
<citation key="ref=3">
<unstructured_citation>Clow GD, McKay CP, Simmons Jr. GM, and Wharton RA, Jr. 1988. Climatological observations and predicted sublimation rates at Lake Hoare, Antarctica. Journal of Climate 1:715-728.</unstructured_citation>
</citation>
</citation_list>
</doi_citations>
</body>
</doi_batch>
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