Mathematics and Plausible Reasoning, Volume 1 Induction and Analogy in Mathematics Polya George Heftet / 1990 / Engelsk
Mathematics and Plausible Reasoning, Volume 2 Logic, Symbolic and mathematical Polya George Heftet / 1990 / Engelsk
Mathematical Discovery on Understanding, Learning and Teaching Problem Solving, Volumes I and II Polya George Heftet / 1981 / Engelsk
Problems and Theorems in Analysis II Theory of Functions. Zeros. Polynomials. Determinants. Number Theory. Geometry Polya George Heftet / 1997 / Engelsk
Problems and Theorems in Analysis I Series. Integral Calculus. Theory of Functions Polya George Heftet / 1997 / Engelsk
