Loken, N. C., & Willoughby, R. J. Complete book of gymnastics.
Cita Chicago (17th ed.)Loken, Newton C., i Robert J. Willoughby. Complete Book of Gymnastics.
Cita MLA (8th ed.)Loken, Newton C., i Robert J. Willoughby. Complete Book of Gymnastics.
Atenció: Aquestes cites poden no estar 100% correctes.