Grupe, F. H. (1989). Microcomputer applications: Using wordperfect, lotus -- and dBASE III plus. Wm. C. Brown Publishers.
Lua i Stíl Chicago (17ú heag.)Grupe, Fritz H. Microcomputer Applications: Using Wordperfect, Lotus -- and DBASE III Plus. Iowa: Wm. C. Brown Publishers, 1989.
Lua MLA (9ú heag.)Grupe, Fritz H. Microcomputer Applications: Using Wordperfect, Lotus -- and DBASE III Plus. Wm. C. Brown Publishers, 1989.
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