@misc{indiciae15c4f16178cc,
  title = {Individual study and educational technology.},
  author = {C E Engel},
  year = {1967},
  doi = {10.1111/j.1365-2923.1967.tb01692.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4169952/},
  note = {Source identifier: 4169952}
}