@misc{indiciaeca3402082532,
  title = {Control-group experimentation in psychotherapy.},
  author = {E F BORGATTA and L S COTTRELL},
  year = {1959},
  doi = {10.1080/00332747.1959.11023162},
  url = {https://pubmed.ncbi.nlm.nih.gov/13634282/},
  note = {Source identifier: 13634282}
}