TY  - RPRT
TI  - Academic grades: their rational and empirical scale structure.
AU  - L R Stone
AU  - E R Sinnett
PY  - 1968
DO  - 10.2466/pr0.1968.22.3.681
UR  - https://pubmed.ncbi.nlm.nih.gov/5653354/
ID  - 5653354
ER  -