Cita APA (7a ed.)
Zipf, G. K. Human Behavior and The Principle of Least Effort: An Introduction to Human Ecology : Facsimile of 1949 Edition. Hafner.
Cita estilo Chicago (17a ed.)
Zipf, George Kingsley. Human Behavior and The Principle of Least Effort: An Introduction to Human Ecology : Facsimile of 1949 Edition. Nueva York, EUA: Hafner.
Cita MLA (9a ed.)
Zipf, George Kingsley. Human Behavior and The Principle of Least Effort: An Introduction to Human Ecology : Facsimile of 1949 Edition. Hafner.
Precaución: Estas citas no son 100% exactas.