@misc{indiciae3776bd7e0d21,
  title = {Thorndike's puzzle boxes.},
  author = {J C Burnham},
  year = {1972},
  doi = {10.1002/1520-6696(197204)8:2<159::aid-jhbs2300080202>3.0.co;2-p},
  url = {https://pubmed.ncbi.nlm.nih.gov/11609710/},
  note = {Source identifier: 11609710}
}