APA استشهاد

Walford, A. J. (1970). Guide to reference material (2nd ed.). The Library Association.

استشهاد بنمط شيكاغو

Walford, A J. Guide to Reference Material. 2nd ed. London: The Library Association, 1970.

MLA استشهاد

Walford, A J. Guide to Reference Material. 2nd ed. The Library Association, 1970.