- Winning Ways for your mathematical plays. Volume 1: Games in General
- Unsolved Problems in Number Theory (Problem Books in Mathematics / Unsolved Problems in Intuitive Mathematics)
- Unsolved Problems in Geometry: Unsolved Problems in Intuitive Mathematics
- Unsolved Problems in Geometry (Problem Books in Mathematics / Unsolved Problems in Intuitive Mathematics)
- Winning Ways for Your Mathematical Plays, Volume 2









