@misc{indiciae68c10af9f6f4,
  title = {Programmed instruction, teacher ability, and subject matter difficulty.},
  author = {J J La Gaipa},
  year = {1968},
  doi = {10.1080/00223980.1968.10543431},
  url = {https://pubmed.ncbi.nlm.nih.gov/5641705/},
  note = {Source identifier: 5641705}
}