APA (7th ed.) Citation

Butterfield, W. H. (1943). 12 ways to write better letters. University of Oklahoma Press.

Chicago Style (17th ed.) Citation

Butterfield, William Henry. 12 Ways to Write Better Letters. Norman: University of Oklahoma Press, 1943.

MLA (9th ed.) Citation

Butterfield, William Henry. 12 Ways to Write Better Letters. University of Oklahoma Press, 1943.