1. "Fish-Eye Lens" by Wai-Kai Chen
2. "Handbook of Optical Systems, Vol. 2: Physical Image Formation" edited by Herbert Gross
3. "Optics in Photography" by Rudolf Kingslake
4. "Introduction to Lens Design: With Practical Zemax Examples" by Joseph M. Geary
5. "Fish-Eye Lens Design" by Willy Sansen