TY  - RPRT
TI  - Effect of punishment on human variable-interval performance.
AU  - C M Bradshaw
AU  - E Szabadi
AU  - P Bevan
PY  - 1977
DO  - 10.1901/jeab.1977.27-275
UR  - https://pubmed.ncbi.nlm.nih.gov/16811989/
ID  - 16811989
ER  -