APA (7th ed.) Citation

Butterfield, W. H. (1951). Effective personal letters (2nd ed.). Prentice-Hall.

Chicago Style (17th ed.) Citation

Butterfield, William H. Effective Personal Letters. 2nd ed. New York: Prentice-Hall, 1951.

MLA (9th ed.) Citation

Butterfield, William H. Effective Personal Letters. 2nd ed. Prentice-Hall, 1951.