Carkhuff, R. R. (1974). Cry twice! Human Resource Development.
Cita Chicago Style (17a ed.)Carkhuff, Robert R. Cry Twice! Amherst, Massachusetts: Human Resource Development, 1974.
Cita MLA (9a ed.)Carkhuff, Robert R. Cry Twice! Human Resource Development, 1974.
Precaución: Estas citas no son 100% exactas.