[DirectX 3 Programmer's Reference] D (94.4444444444444%)

Glossary

[DirectX 5 Programmer's Reference] D (77.7777777777778%)

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[DirectX 6 Programmer's Reference] D (77.7777777777778%)

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[DirectX 7 Programmer's Reference] D (67.7248677248677%)

Microsoft DirectX 7.0 > Glossary

[DirectX October 2006 Documentation] D (33.3333333333333%)

DirectX SDK > Introducing DirectX 9.0 > Namespaces > Microsoft.DirectX > Structures > Plane > Fields