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@misc{141078,
  title        = {Level of Aspiration in Young Children},
  author       = {Lewin, Kurt and
                  Marjorie R. Leonard},
  year         = {1940, about},
  publisher    = {10:54 min.},
  copyright    = {Creative Commons Attribution-NonCommercial},
  url          = {https://vlp-new.ur.de/records/lit39547}
}