APA (7th ed.) Citation

Allen, R. G. (1987). The challenge. Simon & Schuster.

Chicago Style (17th ed.) Citation

Allen, Robert G. The Challenge. New York: Simon & Schuster, 1987.

MLA (9th ed.) Citation

Allen, Robert G. The Challenge. Simon & Schuster, 1987.

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