The Porteus Maze test and the appraisal of retarded adults.

@article{Tobias1962ThePM,
  title={The Porteus Maze test and the appraisal of retarded adults.},
  author={Jeffrey Tobias and J Gorelick},
  journal={American journal of mental deficiency},
  year={1962},
  volume={66},
  pages={600-6}
}