@misc{indiciae150f4acda795,
  title = {Q6H.},
  author = {E F Skinner},
  year = {1968},
  doi = {10.1001/jama.1968.03140300070027},
  url = {https://pubmed.ncbi.nlm.nih.gov/5694932/},
  note = {Source identifier: 5694932}
}