Cita APA (7a ed.)

Freud, S. (1971). Three essays on the theory of sexuality (2a edición.). Avon Books.

Cita Chicago Style (17a ed.)

Freud, Sigmund. Three Essays on the Theory of Sexuality. 2a edición. New York: Avon Books, 1971.

Cita MLA (9a ed.)

Freud, Sigmund. Three Essays on the Theory of Sexuality. 2a edición. Avon Books, 1971.