00619nam a2200181Ia 4500 CTU_42972 210402s9999 xx 000 0 und d 300.72 C771 Thoms D Cook Quasi-experimentation: Design and analysis issues for field settings Thoms D Cook, Donald T Campbell Boston, Massachusetts Houghton Mifflin 1979 factorial experiment design,social science - statistical methods,social sciences - research Minh, 010821 Trung tâm Học liệu Trường Đại học Cần Thơ