1. E.C. Baber: Travels and researches in western China. (John Murray, London 1882).
2. D.C. Baker: T'aishan: an account of the sacred eastern peak of China (reprinted by Cheng Wen Publishing Company, Taipei 1971), originally (1924).
3. W.R. Zhou, X.X. Fan, L. He: Studies in the History of Natural Sciences Vol. 13 No. 1 (1994), pp.61-62. (in Chinese).
4. S.G.E. Bowman, M.R. Cowelland, J. Cribb: Historical Metallurgy, Vol. 23 No. 1 (1989), pp.25-30.
5. J.W. Zhang: Traditional Architecture, Vol. 2 (2008), pp.64-65. (in Chinese).