Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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