Win32 API Programming with Visual Basic
Advanced Visual Basic 6: Power Techniques for Everyday Programs
Visual Basic 6 Win32 API Tutorial
Dan Appleman's Visual Basic Programmer's Guide to the Win32 API
Subclassing and Hooking with Visual Basic: Harnessing the Full Power of VB/VB.NET
Ready-to-Run Visual Basic(r) Algorithms, 2nd Edition
Understanding ActiveX and OLE: A Guide for Developers and Managers (Strategic Technology)
Programming Microsoft® Visual Basic® 6.0
Visual Basic 6 Black Book
Microsoft Visual Basic 6.0: Programmer's Guide