Frick, B. M. (1954). Sears list of subject headings (7a. ed.). Wilson Company.
Lua i Stíl Chicago (17ú heag.)Frick, Bertha Margaret. Sears List of Subject Headings. 7a. ed. New York: Wilson Company, 1954.
Lua MLA (9ú heag.)Frick, Bertha Margaret. Sears List of Subject Headings. 7a. ed. Wilson Company, 1954.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.