APA (7th ed.) Citation

Santos, B., & Manzano, R. G. (2009). Principles of tourism 1. C & E Pub.

Chicago Style (17th ed.) Citation

Santos, Buen, and Ronald G. Manzano. Principles of Tourism 1. Quezon City: C & E Pub, 2009.

MLA (9th ed.) Citation

Santos, Buen, and Ronald G. Manzano. Principles of Tourism 1. C & E Pub, 2009.

Warning: These citations may not always be 100% accurate.