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.
Atenció: Aquestes cites poden no estar 100% correctes.