Dyfyniad APA

Gee, C. Y., Makens, J. C., & Choy, D. J. L. (1989). The travel industry (2nd ed.). Van Nostrand Reinhold.

Dyfyniad Arddull Chicago

Gee, Chuck Y., James C. Makens, and Dexter J. L. Choy. The Travel Industry. 2nd ed. New York: Van Nostrand Reinhold, 1989.

Dyfyniad MLA

Gee, Chuck Y., et al. The Travel Industry. 2nd ed. Van Nostrand Reinhold, 1989.

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