Cita APA (7th ed.)

Ripley, W. Z. (1899). The races of Europe: A sociological study. Appleton.

Cita Chicago (17th ed.)

Ripley, William Zebina. The Races of Europe: A Sociological Study. New York: Appleton, 1899.

Cita MLA (9th ed.)

Ripley, William Zebina. The Races of Europe: A Sociological Study. Appleton, 1899.