Developmental versus difference theories of mental retardation and the problem of motivation.

@article{Zigler1969DevelopmentalVD,
  title={Developmental versus difference theories of mental retardation and the problem of motivation.},
  author={Edward Zigler},
  journal={American journal of mental deficiency},
  year={1969},
  volume={73 4},
  pages={536-56}
}
  • Edward Zigler
  • Published 1969 in American journal of mental deficiency

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