Dyfyniad APA

(1987). Walford's guide to reference material (4th ed.). Library Association.

Dyfyniad Arddull Chicago

Walford's Guide to Reference Material. 4th ed. London: Library Association, 1987.

Dyfyniad MLA

Walford's Guide to Reference Material. 4th ed. Library Association, 1987.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.