Clark, R. E. (1983). Executive VisiCalc for the IBM personal computer. National Book Store.
Lua i Stíl Chicago (17ú heag.)Clark, Roger E. Executive VisiCalc for the IBM Personal Computer. [Manila]: National Book Store, 1983.
Lua MLA (9ú heag.)Clark, Roger E. Executive VisiCalc for the IBM Personal Computer. National Book Store, 1983.
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