por Cohen, Jozef, 1921- [autor] | Humphreys, Lloyd G [colaborador] | Linares, Maria Eugenia [traductor].
por Cohen, Jozef, 1921- [autor] | Galindo Cota, Edgar [traductor] | Humphreys, Lloyd G [editor] | Cohen, Jozef, 1921-. Eyewitness series in pscyhology secondaryy motivation.