TY  - RPRT
TI  - Operant behavior in mental defectives: exploratory studies.
AU  - N R ELLIS
AU  - C D BARNETT
AU  - M W PRYER
PY  - 1960
DO  - 10.1901/jeab.1960.3-63
UR  - https://pubmed.ncbi.nlm.nih.gov/13820047/
ID  - 13820047
ER  -