Cita APA (7a ed.)

deVries, H. A., & Hales, D. R. (1987). Fitness after 50. Charles Scribner's Sons.

Cita Chicago Style (17a ed.)

deVries, Herbert A., y Diane R. Hales. Fitness After 50. New York: Charles Scribner's Sons, 1987.

Cita MLA (9a ed.)

deVries, Herbert A., y Diane R. Hales. Fitness After 50. Charles Scribner's Sons, 1987.