Pratt, C. D., Vadetzsky, E. d., Langwill, K. E., McCloskey, K. E., & Schuemann, H. W. (1970). Twenty years of confectionery and chocolate progress. The AVI Publishing Company.

Pratt, Carl D., Eleanore de Vadetzsky, Katheryn E. Langwill, Kenneth E. McCloskey, and Harry W. Schuemann. Twenty Years of Confectionery and Chocolate Progress. Westport: The AVI Publishing Company, 1970.

Pratt, Carl D., et al. Twenty Years of Confectionery and Chocolate Progress. The AVI Publishing Company, 1970.