Cita APA (7a ed.)

Paulsen, F. (1907). Introduction to Philosophy. Holt and Co. (H.).

Cita Chicago Style (17a ed.)

Paulsen, Friedrich. Introduction to Philosophy. New York: Holt and Co. (H.), 1907.

Cita MLA (8a ed.)

Paulsen, Friedrich. Introduction to Philosophy. Holt and Co. (H.), 1907.