An annual bibliography is a comprehensive list of sources published over the course of a year, typically related to a particular field or subject. Synonyms for annual bibliography include annual index, yearbook, and bibliographic annual. An annual index is a listing of the key subjects, authors and titles which have been covered in the literature over the past year. Similarly, a yearbook may refer to a compendium of information from the past year, including news, events and statistics, or a listing of academic literature. Lastly, a bibliographic annual is a publication that compiles and indexes recent works in a specific field or discipline.