Lua APA (7ú heag.)

Frederick, J. G. (1929). Selling by telephone. Business Bourse Publishers.

Lua i Stíl Chicago (17ú heag.)

Frederick, J. George. Selling by Telephone. New York: Business Bourse Publishers, 1929.

Lua MLA (8ú heag.)

Frederick, J. George. Selling by Telephone. Business Bourse Publishers, 1929.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.