@misc{indiciaeab439868d1ff,
  title = {[Structure model of practical instruction. 1].},
  author = {B Knigge-Demal and A Rustemeier and K Schönlau and M Sieger},
  year = {1993},
  url = {https://pubmed.ncbi.nlm.nih.gov/8260590/},
  note = {Source identifier: 8260590}
}