@misc{indiciae899bb7bf082a,
  title = {Program evaluation. Part 1: Four generations of theory.},
  author = {M T Sarnecky},
  doi = {10.1097/00006223-199009000-00006},
  url = {https://pubmed.ncbi.nlm.nih.gov/2216068/},
  note = {Source identifier: 2216068}
}