APA (7th ed.) Citation

Sheppard, M. (1960). Plain letters: The secret of successful business writing. Simon and Schuster.

Chicago Style (17th ed.) Citation

Sheppard, Mona. Plain Letters: The Secret of Successful Business Writing. New York: Simon and Schuster, 1960.

MLA (9th ed.) Citation

Sheppard, Mona. Plain Letters: The Secret of Successful Business Writing. Simon and Schuster, 1960.

Warning: These citations may not always be 100% accurate.