Halvorson, Michael Microsoft Visual Basic 6.0 : professional step by step / Michael Halvorson - Redmond, Washington : Microsoft Press , 1998 - xxviii, 632 p. : il. ; 23 cm ISBN: 1572318090 Subjects--Topical Terms: Basic (Lenguaje de programación)Microsoft Visual Basic LC Class. No.: QA 76.73 B3 / H338 1998