Cook, R. A., Yale, L. J., & Marqua, J. J. (2002). Tourism: The business of travel (2nd ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Cook, Roy A., Laura J. Yale, agus Joseph J. Marqua. Tourism: The Business of Travel. 2nd ed. Upper Saddle River, N.J: Prentice Hall, 2002.
Lua MLA (9ú heag.)Cook, Roy A., et al. Tourism: The Business of Travel. 2nd ed. Prentice Hall, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.