APA (7e ed.) Bronvermelding

Dittmer, P., & Keefe, J. D. (2009). Principles of food, beverage, and labor cost controls (9th ed.). Wiley.

Chicago (17e ed.) Bronvermelding

Dittmer, Paul, en J. Desmond Keefe. Principles of Food, Beverage, and Labor Cost Controls. 9th ed. Hoboken, N.J: Wiley, 2009.

MLA (9e ed.) Bronvermelding

Dittmer, Paul, en J. Desmond Keefe. Principles of Food, Beverage, and Labor Cost Controls. 9th ed. Wiley, 2009.