ZIPF, G. K. (1972). Human behavior and the Principle of least: Effort; an introduction to human ecology. Hafner publishing Co.
Citace podle Chicago (17th ed.)ZIPF, George Kingsley. Human Behavior and the Principle of Least: Effort; an Introduction to Human Ecology. New York: Hafner publishing Co, 1972.
Citace podle MLA (9th ed.)ZIPF, George Kingsley. Human Behavior and the Principle of Least: Effort; an Introduction to Human Ecology. Hafner publishing Co, 1972.
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