TY  - BOOK
AU  - Gregg, MB.
TI  - Field epidemiology 
SN  - 9780195313802 (cloth : alk. paper)
PY  - 2008///
CY  - Oxford, New York
PB  - Oxford University Press
KW  - Public Health
KW  - Epidemiology
N1  - Includes bibliographical references and index
ER  -