Semmler, W. (1984). Competition, monopoly, and differential profit rates: On the relevance of the classical and Marxian theories of production prices for modern industrial and corporate pricing. New York: Columbia University Press.

Semmler, Willi. Competition, Monopoly, and Differential Profit Rates: On the Relevance of the Classical and Marxian Theories of Production Prices for Modern Industrial and Corporate Pricing. New York: Columbia University Press, 1984.

Semmler, Willi. Competition, Monopoly, and Differential Profit Rates: On the Relevance of the Classical and Marxian Theories of Production Prices for Modern Industrial and Corporate Pricing. New York: Columbia University Press, 1984.