APA (7th ed.) Citation

Le Bon, G., & Widener, A. (1979). Gustave Le Bon: The man and his works. Liberty Press.

Chicago Style (17th ed.) Citation

Le Bon, Gustave, and Alice Widener. Gustave Le Bon: The Man and His Works. Indianapolis: Liberty Press, 1979.

MLA (9th ed.) Citation

Le Bon, Gustave, and Alice Widener. Gustave Le Bon: The Man and His Works. Liberty Press, 1979.