Brubaker, O. J. (1972). Understanding people. Evangelical Teacher Training Association.
Cita Chicago (17th ed.)Brubaker, Omar J. Understanding People. Evangelical Teacher Training Association, 1972.
Cita MLA (9th ed.)Brubaker, Omar J. Understanding People. Evangelical Teacher Training Association, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.