1. Ralph W.G. Wyckoff, CRYSTAL STRUCTURES, 2nd ed., Vol. 1, 1986, Interscience Publishers, A Division of John Wiley & Sons, NY. pp. 108-115 for compounds of type RX; and pp.266-273 for compounds of type RX2.
2. Gerald Burns, Solid State Physics, Academic Press, 1985, Chapters 2 and 3.
3. Charles Kittel, Introduction to Solid STate Physics, 7th ed., Wiley, Chapter 1.