Cita APA (7a ed.)

Walford, A. (1989). Walford's guide to reference material (5th ed.). Library Association.

Cita Chicago Style (17a ed.)

Walford, A.J. Walford's Guide to Reference Material. 5th ed. London: Library Association, 1989.

Cita MLA (9a ed.)

Walford, A.J. Walford's Guide to Reference Material. 5th ed. Library Association, 1989.