Dittmer, P. R. (1984). Principles of food, beverage, and labor cost controls for hotels and restaurants (3rd ed.). Van Nostrand Reinhold.
Lua i Stíl Chicago (17ú heag.)Dittmer, Paul R. Principles of Food, Beverage, and Labor Cost Controls for Hotels and Restaurants. 3rd ed. New York: Van Nostrand Reinhold, 1984.
Lua MLA (9ú heag.)Dittmer, Paul R. Principles of Food, Beverage, and Labor Cost Controls for Hotels and Restaurants. 3rd ed. Van Nostrand Reinhold, 1984.
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