APA aipamena

Walford, A. J. (1990). Walford's guide to reference material. London: Library Association Publishing.

Chicago Style aipamena

Walford, A. J. Walford's Guide to Reference Material. London: Library Association Publishing, 1990.

MLA aipamena

Walford, A. J. Walford's Guide to Reference Material. London: Library Association Publishing, 1990.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.