@misc{indiciaeec3aeca92450,
  title = {Instrument development: always unfinished.},
  author = {M A Williams},
  year = {1989},
  doi = {10.1002/nur.4770120602},
  url = {https://pubmed.ncbi.nlm.nih.gov/2602573/},
  note = {Source identifier: 2602573}
}