APA (7th ed.) Citation

Wundt, W. M. (1912). An introduction to psychology. Macmillan.

Chicago Style (17th ed.) Citation

Wundt, Wilhelm Max. An Introduction to Psychology. New York: Macmillan, 1912.

MLA (9th ed.) Citation

Wundt, Wilhelm Max. An Introduction to Psychology. Macmillan, 1912.