(1) Exploring Language w/Logo - Apple diskette: Apple ® Logo and Apple ® Logo II versions by E. Paul Goldenberg and Wallace Feurzeig ISBN: 9780262570695 MIT Press View at publisher
(2) Exploring Language w/Logo - IBM® diskette: IBM® Logo version by E. Paul Goldenberg and Wallace Feurzeig ISBN: 9780262570725 MIT Press View at publisher