Bill Martens

• All About DOS
• All About Pascal
• Appilot/W1
• What's Where in the APPLE - Enhanced Edition
• All about Applesoft
• Beyond Quest
• Call-A. P. P. L. E. Magazine - 1978 Compendium
• Call-A. P. P. L. E. Magazine - 1979 Compendium
• Gbbs Pro Bulletin Board System
• Peeking at Call-A. P. P. L. E. 1978
• Peeking at Call-A. P. P. L. E. 1979
• Peeking at Call-A. P. P. L. E. 1980