Cratty, B. J. (1968). Psychology and physical activity. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Cratty, Bryant J. Psychology and Physical Activity. New Jersey: Prentice-Hall, 1968.
Lua MLA (9ú heag.)Cratty, Bryant J. Psychology and Physical Activity. Prentice-Hall, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.