APA-referens (7:e uppl.)

Sumner, J. R. (1972). Statistics for hotels and catering. Edward Arnold.

Chicago-referens (17:e uppl.)

Sumner, John R. Statistics for Hotels and Catering. [London]: Edward Arnold, 1972.

MLA-referens (9:e uppl.)

Sumner, John R. Statistics for Hotels and Catering. Edward Arnold, 1972.