@misc{indiciae5c4fed5796b2,
  title = {Activity aids.},
  author = {L G Allbon and B Fifield},
  year = {1970},
  doi = {10.1177/000841747003700102},
  url = {https://pubmed.ncbi.nlm.nih.gov/5198090/},
  note = {Source identifier: 5198090}
}