Erickson F. J. Fritz J. & Vonk J. A. John A. (1995). Computers Concepts, Implications and Applications with Windows 3.1, WordPerfect 6.0 for Windows, Quattro Pro 5.0 for Windows, and Paradox 4.5 for Windows. USA, Wm. C. Brown Communications, 1995.
Čikaški stil citiranja (17. izdanje)Erickson F. J. Fritz J. i Vonk J. A. John A. Computers Concepts, Implications and Applications with Windows 3.1, WordPerfect 6.0 for Windows, Quattro Pro 5.0 for Windows, and Paradox 4.5 for Windows. USA, Wm. C. Brown Communications, 1995, 1995.
MLA način citiranja (9. izdanje)Erickson F. J. Fritz J. i Vonk J. A. John A. Computers Concepts, Implications and Applications with Windows 3.1, WordPerfect 6.0 for Windows, Quattro Pro 5.0 for Windows, and Paradox 4.5 for Windows. USA, Wm. C. Brown Communications, 1995, 1995.