Frick, B. M. (1959). Sears list of subject headings: With suggestions for the beginner in subject heading work (8th ed.). New York: Wilson.
Παραπομπή Chicago StyleFrick, Bertha Margaret. Sears List of Subject Headings: With Suggestions for the Beginner in Subject Heading Work. 8th ed. New York: Wilson, 1959.
Παραπομπή MLAFrick, Bertha Margaret. Sears List of Subject Headings: With Suggestions for the Beginner in Subject Heading Work. 8th ed. New York: Wilson, 1959.
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