TY  - RPRT
TI  - Further study of performance errors on Ravens progressive matrics (1938).
AU  - C Sheppard
AU  - D Fiorentino
AU  - L Collins
AU  - S Merlis
PY  - 1969
DO  - 10.1080/00223980.1969.10543078
UR  - https://pubmed.ncbi.nlm.nih.gov/4388581/
ID  - 4388581
ER  -