@misc{indiciae860dcb0aa09a,
  title = {Motivating autistic children through stimulus variation.},
  author = {G Dunlap and R L Koegel},
  year = {1980},
  doi = {10.1901/jaba.1980.13-619},
  url = {https://pubmed.ncbi.nlm.nih.gov/7204282/},
  note = {Source identifier: 7204282}
}