Gessford, J. E. (1980). Modern information systems: Designed for decision support. Addison-Wesley Pub. Co..
Chicago-viite (17. p.)Gessford, John Evans. Modern Information Systems: Designed for Decision Support. Reading, Mass.: Addison-Wesley Pub. Co., 1980.
MLA-viite (9. p.)Gessford, John Evans. Modern Information Systems: Designed for Decision Support. Addison-Wesley Pub. Co., 1980.
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