Παραπομπή APA

Library Association., Walford, A., & Harvey, J. M. (1980). Walford's guide to reference material (4th. edition.). London: The Library Association.

Παραπομπή Chicago Style

Library Association., A.J Walford, and Joan M. Harvey. Walford's Guide to Reference Material. 4th. edition. London: The Library Association, 1980.

Παραπομπή MLA

Library Association., A.J Walford, and Joan M. Harvey. Walford's Guide to Reference Material. 4th. edition. London: The Library Association, 1980.

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