APA (7th ed.) Citation

Tepper. (1990). The only 250 letters and memos managers will ever need. John Wiley & Sons.

Chicago Style (17th ed.) Citation

Tepper. The Only 250 Letters and Memos Managers Will Ever Need. New York: John Wiley & Sons, 1990.

MLA (8th ed.) Citation

Tepper. The Only 250 Letters and Memos Managers Will Ever Need. John Wiley & Sons, 1990.