Cita APA (7th ed.)

Walford, A. J. (1980). Walford's guide to reference material. Library Association.

Cita Chicago (17th ed.)

Walford, Albert John. Walford's Guide to Reference Material. London: Library Association, 1980.

Cita MLA (9th ed.)

Walford, Albert John. Walford's Guide to Reference Material. Library Association, 1980.