Cita APA (7th ed.)

Gordon, T., & Sands, J. G. (1976). P.E.T. in action. Wyden Books.

Cita Chicago (17th ed.)

Gordon, Thomas, i Judith Gordon Sands. P.E.T. in Action. [New York]: Wyden Books, 1976.

Cita MLA (9th ed.)

Gordon, Thomas, i Judith Gordon Sands. P.E.T. in Action. Wyden Books, 1976.