Schwartz, R. J., & Schiffer, A. M. (1954). Credit and collection know-how. Fairchild Publications.
Lua i Stíl Chicago (17ú heag.)Schwartz, Robert J., agus Allyn M. Schiffer. Credit and Collection Know-how. New York: Fairchild Publications, 1954.
Lua MLA (9ú heag.)Schwartz, Robert J., agus Allyn M. Schiffer. Credit and Collection Know-how. Fairchild Publications, 1954.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.