Gaya APA

Ritchie, J, B., Goeldner, C, R. (2012). Tourism Principles, Practices, Philosophies (12th Ed.). Hoboken, NJ.: John Wiley and Sons, Inc..

Gaya MLA

Ritchie, J.R., Brent., Goeldner, Charles, R.. "Tourism Principles, Practices, Philosophies". 12th Ed. Hoboken, NJ.: John Wiley and Sons, Inc., 2012. BUKU.