TY  - BOOK
AU  - Wittrock,Merlin C.
AU  - Wiley,David E.
TI  - The evaluation of instruction: issues and problems 
SN  - 0030797950
AV  - LB2823.E93 1970 
PY  - 1970///
CY  - New York
PB  - Holt, Rinehart and Winston
KW  - Educational surveys
KW  - Congresses
KW  - Educational tests and measurements
ER  -