TY  - BOOK
AU  - Campbell,  D.  T.
AU  - Stanley J. C
TI  - Experimental and  quasi : Experimental designs for  research
SN  - 0395307872
AV  - Q175.C2 1963 
PY  - 1963///
CY  - Ilallas
PB  - Houghton Mifflin Company
KW  - Experimentakl  designs
ER  -