The general category of the publication, for example, book, book-chapter, newsletter, conference, journal, thesis, legal-doc, other, and unknown
| Value | Meaning |
|---|---|
| book | citation is to a book |
| book-chapter | citation is to a chapter in a book |
| newsletter | citation is to a newsletter |
| conference | citation is to a paper presented at a conference |
| journal | citation is to an article in a journal |
| thesis | citation is to a master's thesis or doctoral dissertation |
| legal-doc | citation is to a legal document |
| web-page | citation is to a document published on the Web |
| other | citation is to a publication type not listed above |
| unknown | citation does not contain enough information for a publication type to be identified |
| Restriction: This attribute must be specified if the element is used. | |