glRotatef() Rotation Matrix

What is the matrix used by glRotatef for 3d position based rotation with an angle? I hear its in the red book but I can’t find it. Thanks

Whichever matrix you have set with glMatrixMode or GL_MODELVIEW (default) if you have not set the matrix.

go to:
click “documentation”
click “OpenGL Specification & Manual Pages”
click “OpenGL Manual Pages (HTML)”
click “__gl/”

Thanks guys