TY  - BOOK
AU  - Van Dalen,Deobold B.
TI  - Understanding educational research: an introduction 
T2  - McGraw-Hill series in education. Psychology and human development in education
AV  - LB1028 .V3
PY  - 1962///
CY  - New York
PB  - McGraw-Hill
KW  - Educational research
ER  -