TY  - RPRT
TI  - Thorndike's puzzle boxes.
AU  - J C Burnham
PY  - 1972
DO  - 10.1002/1520-6696(197204)8:2<159::aid-jhbs2300080202>3.0.co;2-p
UR  - https://pubmed.ncbi.nlm.nih.gov/11609710/
ID  - 11609710
ER  -