APA (7th ed.) Citation

Clapp, J. M. (1935). Doing business by letter: How to write successful letters. Ronald Press.

Chicago Style (17th ed.) Citation

Clapp, John Mantle. Doing Business by Letter: How to Write Successful Letters. New York: Ronald Press, 1935.

MLA (9th ed.) Citation

Clapp, John Mantle. Doing Business by Letter: How to Write Successful Letters. Ronald Press, 1935.