1. American Institute of Physics Handbook 1972, 3rd edition (McGraw-Hill Book Company)
2. Abundances of the elements: Meteoritic and solar
3. Ashcroft, N. W., & Mermin, N. D. 1976, Solid State Physics (Philadelphia: Saunders Company)
4. Bohren, C. F., & Huffman, D. R. 1983, Absorption and Scattering of Light by Small Particles (John Wiley & Sons)