TY  - BOOK
AU  - Roht,Lewis H.
TI  - Principles of epidemiology: a self-teaching guide 
SN  - 0125931808
PY  - 1982///
CY  - New York
PB  - Academic Press
KW  - Epidemiology
KW  - Epidemiologic Methods
N1  - Includes index
ER  -