TY  - BOOK
AU  - Davidson, P. O [ed.]
AU  - Costello, C. G [ed.]
TI  - Experimental studies of single cases: an enduring problem in psychology
U1  - 157 
PY  - 1969///
CY  - New York
PB  - Van Nostrand Reinhold
KW  - Psychology
KW  - Experimental studies
ER  -