Dyfyniad APA

Walker, J. R., & Walker , J. T. (2011). Tourism: Concepts and practices. Pearson.

Dyfyniad Arddull Chicago

Walker, John R., and Josielyn T. Walker. Tourism: Concepts and Practices. New Delhi: Pearson, 2011.

Dyfyniad MLA

Walker, John R., and Josielyn T. Walker. Tourism: Concepts and Practices. Pearson, 2011.

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