00277nam a2200109 a 4500082001600000041000800016100001800024245003500042260005200077300001000129650002800139  a152.5bV375  aENG  aVernon, M. D.  aHuman motivationcM. D. Vernon  aLondonbCambridge at the University Pressc1969  a189 p  aMOTIVACION (PSICOLOGIA)