1. Hill, D.A.: Fibre optics, (Business Books Ltd., London 1977)
2. Elion, G.R., and Elion, H.A.: Fibre optics in communication systems, (Marcel Dekker Inc., New York 1978)
3. Elion, H.A.: The Western Electric Engineer, (Western Electric, New York 1980),24, (1), Special Issue on Lightwaves, Winter
4. Chappell, A., Optoelectronics, (McGraw-Hill Book Co., New York 1978)
5. Miller, S.E., and Chynoweth, A.G.: Optical fibre telecommunications, (Academic Press 1979)