Dyfyniad APA

.Westby, B. M. (1977). Sears list of subject headings (11th ed.). The H. W. Wilson Company.

Dyfyniad Arddull Chicago

.Westby, Barbara M. Sears List of Subject Headings. 11th ed. New York: The H. W. Wilson Company, 1977.

Dyfyniad MLA

.Westby, Barbara M. Sears List of Subject Headings. 11th ed. The H. W. Wilson Company, 1977.

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