TY  - RPRT
TI  - A token economy program evaluation with untreated control ward comparisons.
AU  - R F Gripp
AU  - P A Magaro
PY  - 1971
DO  - 10.1016/0005-7967(71)90071-4
UR  - https://pubmed.ncbi.nlm.nih.gov/5556839/
ID  - 5556839
ER  -