Jozef Plojhar (Plojhar, Jozef)
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Get Knotted!
by John Jaworski, Ian Stewart, Cosgrove, Jozef Plojhar, Liz Cazalet
Softcover, Pan Macmillan, ISBN 0330243799 (0-330-24379-9)
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Nut-Crackers: Puzzles and Games to Boggle the Mind
by John Jaworski, Ian Stewart, Cosgrove, Jozef Plojhar
Softcover, Pan Macmillan, ISBN 0330027956 (0-330-02795-6)