APA (7th ed.) Citation

Clapp, J. M. (1935). Personal letters in business: A guide to correct usage. The Ronald press company.

Chicago Style (17th ed.) Citation

Clapp, John Mantle. Personal Letters in Business: A Guide to Correct Usage. New York: The Ronald press company, 1935.

MLA (9th ed.) Citation

Clapp, John Mantle. Personal Letters in Business: A Guide to Correct Usage. The Ronald press company, 1935.