@misc{indiciae1cca31c20680,
  title = {Validity in field research.},
  author = {P J Brink},
  year = {1990},
  doi = {10.1177/019394599001200301},
  url = {https://pubmed.ncbi.nlm.nih.gov/2363285/},
  note = {Source identifier: 2363285}
}