(1980). Walford's guide to reference material (4th ed.). The Library Association.
Style de citation Chicago (17e éd.)Walford's Guide to Reference Material. 4th ed. London: The Library Association, 1980.
Style de citation MLA (9e éd.)Walford's Guide to Reference Material. 4th ed. The Library Association, 1980.
Attention : ces citations peuvent ne pas être correctes à 100%.