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Many Leftypedia articles have an ISBN alongside the bibliographical entry for each book. Clicking on the linked 10- or 13-digit number links to Special:BookSources. This shows whether the particular book is listed in a library catalogue, at WorldCat, at Google Books, at major booksellers, or at other websites.

OCLC identifiers were developed for use at, an online resource for finding books in library catalogues, in order to reference books or other resources which lack an ISBN. This may appear in a citation instead of, or alongside, an ISBN.

An example of a bibliographical entry as a reference or a suggestion for further reading would look like this:

  • Carr, Edward Hallett (1972). What is History?: The George Macauley Trevelyan Lectures Delivered in the University of Cambridge, January–March 1961. Harmondsworth; Ringwood: Penguin Books. ISBN 0-14-020652-3. OCLC 12512653.

The ISBN might lack hyphens between the digits, or it might contain spaces between the digits. Either way it should provide the link to Special:BookSources. Note that different editions of the same book may have different ISBNs. Also, books published prior to the 1970s do not have ISBNs, unless subsequently reprinted, but may have an OCLC number.

See also