Hergert , Douglas. Microsoft QuickBASIC Programmer's reference / Douglas Hergert. - 1st ed. - Carmel , Ind. : Howard W. Sams, 1990. - xxvii , 480 p. ; 23 cm. ISBN: 0672227002 Subjects--Uniform Titles: Microsoft QuickBASIC Dewey Class. No.: 005.133 / HER