TY  - BOOK
AU  - Van Dalen,Deobold B.
TI  - Understanding educational research: an introduction 
SN  - 0070668825
U1  - 370.78 
PY  - 1973///
CY  - New York
PB  - McGraw-Hill
KW  - Education
KW  - Research
N1  - Bibliography: p. 507-515
ER  -