Gaya APA

Goeldner, C, R., Ritchie, J, B. (2009). Tourism Principles, Practice, Philosophies (11th Ed.). New Jersey: John Wiley & Sons, Inc..

Gaya MLA

Goeldner, Charles, R.., Ritchie, J.R., Brent. "Tourism Principles, Practice, Philosophies". 11th Ed. New Jersey: John Wiley & Sons, Inc., 2009. BUKU.