Refrences -

Greg Kaiser's 4D Tetris.

The OpenGL Utility Toolkit (GLUT) Programming Interface API Version 3
 - Author: Mark J. Kilgard, Silicon Graphics, Inc.
 - Resource: http://reality.sgi.com/mjk_asd/spec3/spec3.html

The OpenGL Graphics System: A Specification (Version 1.1)
 - Authors: Mark Segal, Kurt Akeley 
 - Editor: Chris Frazier
 - Resource: http://trant.sgi.com/opengl/docs/Specs/glspec1.1/glspec.html

OpenGL doc in HTML
 - From: OpenGL Reference Manual -- The Official Reference Document for OpenGL, Release 1
	 - Taken from the refrence pages
 - Author: Uwe Behrens
 - Resource: http://www.cevis.uni-bremen.de/~uwe/opengl/

OpenGL Functions and Their IRIS GL Equivalents
 - Released by: Microsoft in MSDN Online Library
 - Resource: http://msdn.microsoft.com/library/psdk/opengl/appenda1_3soj.htm