[DirectX 7 Programmer's Reference] COM Reference Count Semantics for Surfaces (100%)
Microsoft DirectX 7.0 > DirectDraw > DirectDraw Essentials > Surfaces
[DirectX 8.1 C/C++ Programmer's Reference] COM Helper Functions (32.472749969553%)
DirectX 8.1 (C++) > DirectShow > DirectShow Reference > DirectShow Base Classes > Utility Functions
[DirectX October 2006 Documentation] COM Object Overview (19.1797516420361%)
DirectX Software Development Kit > DirectX SDK Programming Guide > Using COM