@misc{indiciae95b931b8a84c,
  title = {Controlled trials in behaviour therapy.},
  author = {I M Marks and M G Gelder},
  year = {1969},
  doi = {10.1002/9780470719664.ch5},
  url = {https://pubmed.ncbi.nlm.nih.gov/4897353/},
  note = {Source identifier: 4897353}
}