Slobodan D. Pesic (Pesic, Slobodan D.)

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  The Cube: Keep the Secret
  by Annie Gottlieb, Slobodan D. Pesic
  Softcover, Harpercollins, ISBN 0062512668 (0-06-251266-8)
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  Secrets of the Cube: The Ancient Visualization Game That Reveals Your True Self
  by Annie Gottlieb, Slobodan D. Pesic
  Softcover, Hyperion Books, ISBN 0786882573 (0-7868-8257-3)