@misc{indiciae1840e50f8998,
  title = {Signal functions in delayed reinforcement.},
  author = {K A Lattal},
  year = {1984},
  doi = {10.1901/jeab.1984.42-239},
  url = {https://pubmed.ncbi.nlm.nih.gov/16812387/},
  note = {Source identifier: 16812387}
}