Citazione Stile APA (7a Edizione)

Loken, N. C., & Willoughby, R. (1977). The complete book of gymnastics (3rd ed.). Prentice-Hall.

Citazione stile Chigago Style (17a edizione)

Loken, Newton C., e Robert Willoughby. The Complete Book of Gymnastics. 3rd ed. Englewood Cliffs, New Jersey: Prentice-Hall, 1977.

Citatione MLA (9a ed.)

Loken, Newton C., e Robert Willoughby. The Complete Book of Gymnastics. 3rd ed. Prentice-Hall, 1977.