TY  - BOOK
AU  - Warwick,Donald  P.
AU  - Osherson,Samuel
TI  - Comparative research methods.  / 
SN  - 013153940 X
U1  - 300.72 
PY  - 1973///]
CY  - Englewood Cliffs : 
PB  - Prentice-Hall , 
KW  - Social sciences
KW  - Research
N1  -  Includes bibliographical references
ER  -