campbell,
experimental and quasi-experimental designs for research: donald; - 1 - u.s.a: rand manally 1963, - 84, ix. 24
no index
includes references
528-61400-2 (paper back):
t--mutiple authors
001 4 cam
experimental and quasi-experimental designs for research: donald; - 1 - u.s.a: rand manally 1963, - 84, ix. 24
no index
includes references
528-61400-2 (paper back):
t--mutiple authors
001 4 cam