A main entry is the first and, in any case, necessary entry of a publication in a library catalog . At the time of the card catalog , the main entry of a publication was sorted in the corresponding place in the alphabetical catalog . For example, classification according to the name of the author, the author or the publication title is possible. Further entries were referred to as secondary entries .
- Klaus Gantert, Rupert Hacker : Basic librarianship. 8th, completely revised and expanded edition. Saur, Munich 2008, ISBN 978-3-598-11771-8 , pp. 169-170.
- Dietmar Strauch , Margarete Rehm: Lexicon book, library, new media. 2nd, updated and expanded edition. Saur, Munich 2007, ISBN 978-3-598-11757-2 , p. 210