@misc{indiciae6784b3d9ffa0,
  title = {A Discrimination without Previous Conditioning.},
  author = {B F Skinner},
  year = {1934},
  doi = {10.1073/pnas.20.9.532},
  url = {https://pubmed.ncbi.nlm.nih.gov/16577633/},
  note = {Source identifier: 16577633}
}