Gaya APA

Ritchie, C, R, G, A, J, R, B. (2018). Tourism: Principles and Practice (Ed. 6). United of Kingdom: Pearson Education Limited.

Gaya MLA

Ritchie, Charlec, R., Goeldner, And, J., R., Brent. "Tourism: Principles and Practice". Ed. 6 United of Kingdom: Pearson Education Limited, 2018. Text.