ZIPF, G. K. (1972). Human behavior and the Principle of least: Effort; an introduction to human ecology. Hafner publishing Co.
Chicago-Zitierstil (17. Ausg.)ZIPF, George Kingsley. Human Behavior and the Principle of Least: Effort; an Introduction to Human Ecology. New York: Hafner publishing Co, 1972.
MLA-Zitierstil (9. Ausg.)ZIPF, George Kingsley. Human Behavior and the Principle of Least: Effort; an Introduction to Human Ecology. Hafner publishing Co, 1972.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.