By Campbell, Donald Thomas,.
Buenos Aires Amorrortu 1973 .
158 p. , Translation of : Experimental and quasi-experimental designs for research.

By Segall, Marshall H..
Indianapolis Bobbs-Merrill Co. 1966 .
xvii, 268 p. 21 cm..

By Campbell, Donald Thomas,.
Boston Houghton Mifflin 1963 .
ix, 84 p. , "Reprinted from Handbook of research on teaching." 24 cm..
0395307872