000 00272nam a22001097a 4500
999 _c60689
_d60689
020 _a9780140124996
100 _aGeorge Pólya
245 _aHow to Solve It: A New Aspect of Mathematical Method
260 _aCanada
_bPenguin Books
_c1990
300 _axl+229
942 _cBK