High-flying paper airplanesBookman International B.V., Jacob Botermans · First published 2005Open the Tome
The Tangram BookJerry Slocum, Jacob Botermans, Dieter Gebhardt, Monica Ma, Xiaohe Ma, Harold Raizer, Dic Sonneveld, Carla van Splunteren · First published 2004Open the Tome
Tricky Optical Illusion PuzzlesJerry Slocum, Jacob Botermans · First published 2001 · Latest edition 2003Open the Tome
