TY  - BOOK
AU  - Pólya,George
TI  - How to solve it: a new aspect of mathematical method 
U1  - 510 23
PY  - 1957///
CY  - Garden City, N.Y
PB  - Doubleday
KW  - Mathematics
KW  - Problems, exercises, etc
KW  - Study and teaching
ER  -