@misc{indiciae84e22e873e3d,
  title = {Operational definitions for service, training, education, and learning.},
  author = {J H Grubbs},
  year = {1977},
  doi = {10.1097/00001888-197703000-00003},
  url = {https://pubmed.ncbi.nlm.nih.gov/839511/},
  note = {Source identifier: 839511}
}