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I'm currently reading:
_The Tao Of Objects_ by Gery Entsminger, published by M&T Books. I have
found this to be a great resource. It discusses OOP in the context of
C++, Delphi, DBASE for Windows, and Visual Basic. I have been very
pleased with what I have been able to learn from it. The "Tao of..."
title has become a cliche, but the book works well within that construct
anyway.
An excellent overview is "Object Oriented Technology: A Managers Guide" by David A. Taylor, Ph.D.