TY  - BOOK
AU  - Nachmias David
AU  -  Nachmias Chava
TI  - Research methods in the social sciences
U1  - Sigma b4, L6 
PY  - 1976///
CY  - New York
PB  - St. Martin's Press USA      
KW  - Social Science
N1  - Bibliography chapterwise,; Appendix P 301-15
ER  -