TY  - BOOK
AU  - Nagel,Stuart S.
ED  - Policy Studies Organization.
TI  - Policy theory and policy evaluation: Concepts, knowledge, causes, and norms 
SN  - 0313273561 (lib. bdg. : alk. paper)
PY  - 1990///
CY  - New York
PB  - Greenwood Press
KW  - Policy sciences
KW  - Evaluation research (Social action programs)
N1  - "Prepared under the auspices of the Policy Studies Organization."; Includes bibliographical references (p. [205]-212) and indexes
ER  -