TY  - BOOK
AU  - Hulley, SB.
AU  - Cummings, SR.
TI  - Designing clinical research: an epidemiologic approach 
SN  - 9780683042498 (pbk.)
PY  - 1988///
CY  - Baltimore
PB  - Williams & Wilkins
KW  - Public Health
KW  - Research Methodology
N1  - Includes bibliographies and index
ER  -