TY  - RPRT
TI  - Operational definitions for service, training, education, and learning.
AU  - J H Grubbs
PY  - 1977
DO  - 10.1097/00001888-197703000-00003
UR  - https://pubmed.ncbi.nlm.nih.gov/839511/
ID  - 839511
ER  -