APA
Gray W. S., . (2003). Hotel and motel management and operations 4th ed. [Place of publication not identified]: Pearson Education Asia Pte Ltd.
Chicago
Gray William S, . 2003. Hotel and motel management and operations 4th ed. [Place of publication not identified]: Pearson Education Asia Pte Ltd.
Harvard
Gray W. S., . (2003). Hotel and motel management and operations 4th ed. [Place of publication not identified]: Pearson Education Asia Pte Ltd.
MLA
Gray William S, . Hotel and motel management and operations 4th ed. [Place of publication not identified]: Pearson Education Asia Pte Ltd. 2003.