Dyfyniad APA

Cook, R. A., Yale, L. J., & Marqua, J. J. (1999). Tourism: The business of travel. Upper Saddle River, N.J: Prentice Hall.

Dyfyniad Arddull Chicago

Cook, Roy A., Laura J. Yale, và Joseph J. Marqua. Tourism: The Business of Travel. Upper Saddle River, N.J: Prentice Hall, 1999.

Dyfyniad MLA

Cook, Roy A., Laura J. Yale, và Joseph J. Marqua. Tourism: The Business of Travel. Upper Saddle River, N.J: Prentice Hall, 1999.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.