1. H. C. King,The History of the Telescope, Dover Publications, New York (1979).
2. E. Hecht,Optics, 2nd ed., Addison-Wesley Publishing Company, Reading, MA (1987).
3. R. N. Wilson,Reflecting Telescope Optics I, Basic Design Theory and Its Historical Development, Springer (1996).
4. X-ray telescopes
5. Formation of Optical Images by X-Rays