APA-referens

Cook, R. A., Laura J Yale, & Joseph J Marqua. (2011). Tourism: The business of travel (3rd ed.). DK.

Chicago-stil citat

Cook, Roy A., Laura J Yale, och Joseph J Marqua. Tourism: The Business of Travel. 3rd ed. Noida: DK, 2011.

MLA-referens

Cook, Roy A., et al. Tourism: The Business of Travel. 3rd ed. DK, 2011.