Geometric transformations /

ανά Yaglom, I. M.
Έκδοση 1962

Challenging methematical problems with elementary solutions /

ανά Yaglom, A. M
Έκδοση 1987

Selected problems and theorems in elementary mathematics : : arithmetic and algebra /

ανά Shklyarsky, D. O.
Έκδοση 1979