APA (7th ed.) Citation

Collier, R. (1941). The Robert Collier letter book (5th ed.). Income builder.

Chicago Style (17th ed.) Citation

Collier, Robert. The Robert Collier Letter Book. 5th ed. New York, N.Y.: Income builder, 1941.

MLA (9th ed.) Citation

Collier, Robert. The Robert Collier Letter Book. 5th ed. Income builder, 1941.