@misc{indiciae10149f1d0e40,
  title = {New aids for instruction.},
  author = {M K Beyrer},
  year = {1972},
  doi = {10.1111/j.1746-1561.1972.tb00957.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4109438/},
  note = {Source identifier: 4109438}
}