Loken, N. C., & Willoughby, R. J. Complete book of gymnastics.
Lua i Stíl Chicago (17ú heag.)Loken, Newton C., agus Robert J. Willoughby. Complete Book of Gymnastics.
Lua MLA (8ú heag.)Loken, Newton C., agus Robert J. Willoughby. Complete Book of Gymnastics.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.