Cassel, D. (1990). Learning Dos, WordPerfect 4.2, Lotus 1-2-3, Twin and dBase III Plus. Englewood Cliffs, New Jersey: Prentice-Hall.
Čikaški stil citiranjaCassel, Don. Learning Dos, WordPerfect 4.2, Lotus 1-2-3, Twin and DBase III Plus. Englewood Cliffs, New Jersey: Prentice-Hall, 1990.
MLA način citiranjaCassel, Don. Learning Dos, WordPerfect 4.2, Lotus 1-2-3, Twin and DBase III Plus. Englewood Cliffs, New Jersey: Prentice-Hall, 1990.
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