TY - BOOK AU - Roos,Leslie L AU - Caporaso,James A TI - Quasi-experimental approaches: testing theory and evaluating policy SN - 0810104199 AV - H62 .C3382 U1 - 300.72 22 PY - 1973/// CY - Evanston PB - Northwestern University Press KW - Social sciences KW - Research KW - Experimental design KW - Methodology N1 - Bibliography: p. [333]-361 ER -