Dr. Eccos Profi-Rätsel für Freaks, Cracks und andere Fortgeschrittene Autor Dennis E Shasha 22 iun 2005 Paperback Preț: 133.80 lei 17-23 zile | 7-13 zile
Dr Ecco′s Cyberpuzzles – 36 Puzzles for Hackers & Other Mathematical Detectives Autor Dennis E Shasha 19 feb 2004 Paperback Preț: 118.28 lei 3-5 săpt.
Puzzling Adventures – Tales of Strategy, Logic and Mathematical Skill Autor Dennis E Shasha 14 mar 2005 Paperback Preț: 92.90 lei 4-6 săpt.