APA (7th ed.) Citation

Gumplowicz, L. (1975). The outlines of sociology. Arno Press.

Chicago Style (17th ed.) Citation

Gumplowicz, Ludwig. The Outlines of Sociology. New York: Arno Press, 1975.

MLA (9th ed.) Citation

Gumplowicz, Ludwig. The Outlines of Sociology. Arno Press, 1975.

Warning: These citations may not always be 100% accurate.