[DirectX 7 Programmer's Reference] Environment Mapping (43.5128222852008%)
Microsoft DirectX 7.0 > Direct3D > Direct3D Immediate Mode > Direct3D Immediate Mode Essentials > Common Techniques and Special Effects
[DirectX October 2006 Documentation] Environment Mapping (34.2156862745098%)
DirectX Graphics > Direct3D 9 > Programming Guide > Advanced Topics > Pixel Pipeline
[DirectX October 2006 Documentation] Environment Mapping Explained (27.8945414372646%)
DirectX Graphics > Direct3D 9 > Tutorials and Samples > Tutorials > HLSL Workshop > Goal 3 - Environment Mapping