Verbal compared with manipulative solution of an apparatus-problem.

@article{Ray1957VerbalCW,
  title={Verbal compared with manipulative solution of an apparatus-problem.},
  author={W S Ray},
  journal={The American journal of psychology},
  year={1957},
  volume={70 2},
  pages={289-90}
}
  • W S Ray
  • Published 1957 in The American journal of psychology