BabyBlue—a free, Creative Commons-licensed implementation of the Bluebook’s Uniform System of Citation. BabyBlue was compiled by a team of students at the New York University School of Law, working under the direction of Professor Christopher Jon Sprigman.
provides main concepts and properties for describing citations and bibliographic references (i.e. quotes, books, articles, etc) on the Semantic Web. The Bibliographic Ontology is an effort of ZitGist LLC. Brian D'Arcus and Zotero to express citations and
COinS (ContextObjects in Spans) is a simple, ad hoc community specification for publishing OpenURL references in HTML. What does it look like? Just what it says: ContextObjects in Spans.
CrossRef’s mandate is to connect users to primary research content, by enabling publishers to work collectively. CrossRef is also the official DOI® link registration agency for scholarly and professional publications. Our citation-linking network today covers tens of millions of articles and other content items from several hundred scholarly and professional publishers.