@misc{indiciae4b592079cf21,
  title = {Letter: Extrinsic incentives and token-based programs. A reevaluation.},
  author = {J D Ford and S L Foster},
  year = {1976},
  doi = {10.1037//0003-066x.31.1.87},
  url = {https://pubmed.ncbi.nlm.nih.gov/1247208/},
  note = {Source identifier: 1247208}
}