1. The Mesomorphic State - Liquid Crystals
2. “Molecular Structure, and the Properties of Liquid Crystals.”;Gray,1962
3. G. H. Brown, G. J. Dienes, and M. M. Labes, “Liquid Crystals I,” Int. Liquid Crystal Conf., (Pap.), 1st, 1965, Gordon & Breach, New York, 1967.