TY  - BOOK
AU  - Campbell, Donald T. 
AU  - Stanley, Julian C. 
TI  - Experimental and quasi-experimental designs for research / 
U1  - FOR 001.434 C15e 1963 
PY  - 1963///
CY  - Boston : 
PB  - Houghton Mifflin Company, 
KW  - Research
KW  - Methodology
N1  - Includes index; References: pages 71-76
ER  -