TY  - BOOK
AU  - Portney, Leslie Gross.
AU  - Watkins, Mary P.
TI  - Foundations of clinical research: applications to practice 
SN  - 0838510655
PY  - 1993///
CY  - Norwalk, Conn.
PB  - Appleton & Lange
KW  - Research Design
N1  - Includes bibliographical references and index
ER  -