How to solve it
P�olya, George
How to solve it - 2. ed - New York Penguin Books 1990 - XLI, 253 S. graph. Darst. - Penguin mathematics .
9780140124996
510.7
How to solve it - 2. ed - New York Penguin Books 1990 - XLI, 253 S. graph. Darst. - Penguin mathematics .
9780140124996
510.7