APA-referens (7:e uppl.)

Gray, W. S. (1980). Hotel and motel management and operations. Prentice Hall.

Chicago-referens (17:e uppl.)

Gray, William S. Hotel and Motel Management and Operations. Englewood Cliffs, N.J: Prentice Hall, 1980.

MLA-referens (9:e uppl.)

Gray, William S. Hotel and Motel Management and Operations. Prentice Hall, 1980.