Gaya APA

Ritchie, J, B., Goeldner, C, R. (2006). Tourism Principles, Practice, Philosophies (10th Ed). New Jersey: John Wiley& Sons, Inc..

Gaya MLA

Ritchie, J.R., Brent., Goeldner, Charles, R.. "Tourism Principles, Practice, Philosophies". 10th Ed New Jersey: John Wiley& Sons, Inc., 2006. BUKU.