TY  - RPRT
TI  - Controlled experiments in teaching.
AU  - C R JOYCE
AU  - M WEATHERALL
PY  - 1957
DO  - 10.1016/s0140-6736(57)92346-2
UR  - https://pubmed.ncbi.nlm.nih.gov/13464080/
ID  - 13464080
ER  -