David W. Fanning, IDL Programming Techniques, Fanning Software Consulting, 2642 Bradbury Court, Ft. Collins, CO. 80521. http://www.dfanning.com. email: books@dfanning.com
Liam E. Gumley, Practical IDL Programming, Morgan Kaufmann Publishing, New York, 2002. ISBN1-55860-700-5.
Ronn Kling, Application Development with IDL: Combining analytical methods with widget programming, Ronn Kling Consulting, 7038 Westmoreland Dr., Warrenton, VA 20187. http://www.rlkling.com email: ronn@rlkling.com.