TY  - RPRT
TI  - What is ... a study guide?
AU  - J M Laidlaw
AU  - R M Harden
PY  - 1990
DO  - 10.3109/01421599009010556
UR  - https://pubmed.ncbi.nlm.nih.gov/2233185/
ID  - 2233185
ER  -