APA (7th ed.) Citation

Riebel, J. P. (1953). How to write successful business letters in 15 days. Prentice-Hall.

Chicago Style (17th ed.) Citation

Riebel, John P. How to Write Successful Business Letters in 15 Days. New York: Prentice-Hall, 1953.

MLA (9th ed.) Citation

Riebel, John P. How to Write Successful Business Letters in 15 Days. Prentice-Hall, 1953.