APA (7th ed.) Citation

Horn, E., & Peterson, T. (1943). The basic vocabulary of business letters: Words most commonly used in writing business letters. Gregg.

Chicago Style (17th ed.) Citation

Horn, Ernest, and Thelma Peterson. The Basic Vocabulary of Business Letters: Words Most Commonly Used in Writing Business Letters. New York: Gregg, 1943.

MLA (9th ed.) Citation

Horn, Ernest, and Thelma Peterson. The Basic Vocabulary of Business Letters: Words Most Commonly Used in Writing Business Letters. Gregg, 1943.