APA (7th ed.) Citation

Phillips, B. L., Shepherd, F., & Olsen, M. (1979). The American quarter horse. D. McKay.

Chicago Style (17th ed.) Citation

Phillips, Betty Lou, Francis Shepherd, and Marce Olsen. The American Quarter Horse. New York: D. McKay, 1979.

MLA (9th ed.) Citation

Phillips, Betty Lou, et al. The American Quarter Horse. D. McKay, 1979.