TY  - RPRT
TI  - Incentives affecting behavior changes in the retarded.
AU  - J Rapp
AU  - E A Lemke
AU  - J Landis
PY  - 1971
DO  - 10.1177/001440297103800306
UR  - https://pubmed.ncbi.nlm.nih.gov/5119945/
ID  - 5119945
ER  -