Cita APA (7th ed.)

Cruz, Z. L. (2013). Principles of tourism. Rex Book Store.

Cita Chicago (17th ed.)

Cruz, Zenaida Lansangan. Principles of Tourism. Manila: Rex Book Store, 2013.

Cita MLA (9th ed.)

Cruz, Zenaida Lansangan. Principles of Tourism. Rex Book Store, 2013.