BERRY, T. (1986). Business planning with IBM personal decision software. Dow Jones-Irwin.
Lua i Stíl Chicago (17ú heag.)BERRY, Tomothy. Business Planning with IBM Personal Decision Software. Illinois: Dow Jones-Irwin, 1986.
Lua MLA (9ú heag.)BERRY, Tomothy. Business Planning with IBM Personal Decision Software. Dow Jones-Irwin, 1986.
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