TY  - RPRT
TI  - Controlled trials in behaviour therapy.
AU  - I M Marks
AU  - M G Gelder
PY  - 1969
DO  - 10.1002/9780470719664.ch5
UR  - https://pubmed.ncbi.nlm.nih.gov/4897353/
ID  - 4897353
ER  -