Cruz, Z. L. (1999). Principles and ethics of tour guiding. Rex Book Store.
芝加哥风格引文Cruz, Zenaida Lansangan. Principles and Ethics of Tour Guiding. Manila: Rex Book Store, 1999.
MLA引文Cruz, Zenaida Lansangan. Principles and Ethics of Tour Guiding. Rex Book Store, 1999.
警告：这些引文格式不一定是100％准确.