APA
Cruz Z. L., . (1999). Principles of tourism part 1. [Place of publication not identified]: Rex Book Store.
Chicago
Cruz Zenaida L, . 1999. Principles of tourism part 1. [Place of publication not identified]: Rex Book Store.
Harvard
Cruz Z. L., . (1999). Principles of tourism part 1. [Place of publication not identified]: Rex Book Store.
MLA
Cruz Zenaida L, . Principles of tourism part 1. [Place of publication not identified]: Rex Book Store. 1999.