Amotivational syndrome: the real management problem of schizophrenia.
Andrews WN, King MH.
Can Med Assoc J. 1972 Jun 10;106(11):1208-10 passim.
PMID:4338368
Testing the Amotivational Syndrome: Marijuana Use Longitudinally Predicts Lower Self-Efficacy Even After Controlling for Demographics, Personality, and Alcohol and Cigarette Use.