How to Solve it Princeton Science Library Autor G. Polya et al. noi 2014 Paperback Preț: 120.86 lei 22-36 zile | 5-11 zile
Mathematics and Plausible Reasoning, Volume 2 Autor G. Polya 23 aug 1990 Paperback Preț: 351.44 lei 43-57 zile