TY  - BOOK
AU  - Krulik,Stephen
AU  - Rudnick,Jesse A.
TI  - Problem solving: a handbook for teachers 
SN  - 0205068472 :
AV  - QA63 .K78
PY  - 1980///
CY  - Boston
PB  - Allyn and Bacon
KW  - Problem solving
N1  - Bibliography: p. 117-118
ER  -