Crossley, J. C., & Jamieson, L. M. (1988). Introduction to commercial and entrepreneurial recreation. Sagamore Publishing.
Lua i Stíl Chicago (17ú heag.)Crossley, John C., agus Lynn Marie Jamieson. Introduction to Commercial and Entrepreneurial Recreation. Champaign, IL: Sagamore Publishing, 1988.
Lua MLA (9ú heag.)Crossley, John C., agus Lynn Marie Jamieson. Introduction to Commercial and Entrepreneurial Recreation. Sagamore Publishing, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.