APA (7th ed.) Citation

Martin, E. D. (1920). The behavior of crowds: A psychological study. Harper & brothers.

Chicago Style (17th ed.) Citation

Martin, Everett Dean. The Behavior of Crowds: A Psychological Study. New York, London: Harper & brothers, 1920.

MLA (9th ed.) Citation

Martin, Everett Dean. The Behavior of Crowds: A Psychological Study. Harper & brothers, 1920.