Cita APA (7th ed.)
Gulick, J. T. (1905). Evolution, racial and habitudinal.
Cita Chicago (17th ed.)
Gulick, John T. Evolution, Racial and Habitudinal. Washington, 1905.
Cita MLA (9th ed.)
Gulick, John T. Evolution, Racial and Habitudinal. 1905.
Atenció: Aquestes cites poden no estar 100% correctes.