1. Blyth, F.G.H. A Geology for Engineers., 1943. Edward Arnold & Co., London.
2. Blyth, F.G.H. , de Freitas, M.H., A Geology for Engineers. 7th edn, 1984. Edward Arnold, London.
3. William Whitehead Watts, 1860-1947
4. British Standards Institition Code of practice for site investigations. BS 5930:1981., 1981. British Standards Institution, London.
5. Brown, J. A hundred years of civil engineering at South Kensington; the origins and history of the Department of Civil Engineering of Imperial College 1884–1984., 1985. Civil Engineering Department, Imperial College, London.