Gaya APA

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

Gaya MLA

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