TY  - RPRT
TI  - A comparison of group-centered and individual-centered activity programs.
AU  - H Y EFRON
AU  - H K MARKS
AU  - R HALL
PY  - 1959
DO  - 10.1001/archpsyc.1959.03590050120015
UR  - https://pubmed.ncbi.nlm.nih.gov/13819488/
ID  - 13819488
ER  -