TY  - BOOK
AU  - Webb Penny, and others
TI  - Essential epidemiology:  An introduction for Students and  Health Professionals   
SN  - 0521546613
U1  - Y9(L:4:51), P5 
PY  - 2005///
CY  - Cambridge
PB  - Cambridge Univesity Press        
KW  - Sociology of Medicine
N1  - Bibliography chapterwise; Appendix: p 334-343
ER  -