Halvorson, M. (1997). Microsoft Visual Basic 5 step by step. Microsoft Press.
Lua i Stíl Chicago (17ú heag.)Halvorson, Michael. Microsoft Visual Basic 5 Step by Step. Redmond, Wa: Microsoft Press, 1997.
Lua MLA (9ú heag.)Halvorson, Michael. Microsoft Visual Basic 5 Step by Step. Microsoft Press, 1997.
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