Quasi-experimentation : design & analysis issues for field settings / Thomas D. Cook, Donald T. Campbell. Cook, Thomas D. Campbell, Donald T. (Donald Thomas), 1916-1996, author. Social sciences Research. Social sciences Fieldwork. 122 COQ Includes indexes. Bibliography: p. 387-396. Boston : Houghton Mifflin Co., c1979. c1979. 1979 Text xii, 405 p. : eng