APA (7th ed.) Citation

Gumplowicz, L., & Horowitz, I. L. (1963). Outlines of sociology ([2nd English language ed.].). Paine-Whitman.

Chicago Style (17th ed.) Citation

Gumplowicz, Ludwig, and Irving Louis Horowitz. Outlines of Sociology. [2nd English language ed.]. New York: Paine-Whitman, 1963.

MLA (9th ed.) Citation

Gumplowicz, Ludwig, and Irving Louis Horowitz. Outlines of Sociology. [2nd English language ed.]. Paine-Whitman, 1963.