• Chinese-English Dictionary: mandarintools.com
  • Travel China Guide: travelchinaguide.com/china_great_wall/construction
  • Gotshalk, Richard. Divination, Order and the Zhouyi, University Press of America, Lanham, c1999
  • Baynes, Cary F. The I ching or Book of Changes: The Richard Wilhelm Translation Rendered into English, Princeton University Press, Princeton, NJ, 1967
  • Legge, James (tr.). I Ching in Sacred Books of the East, vol. 16, 1899 at sacred-texts.com/ich/index.htm
  • Li Shao Bai. The Wild Great Wall, People‚Äôs Fine Arts Publishing House, Beijing, 2003
  • Lynn, Richard John. The Classic of Changes: A New Translation of the I Ching as interpreted by Wang Bi, Columbia University Press, New Yorki, c1994
  • Schwartz, Daniel. The Great Wall of China, Thames & Hudson, London, 1991
  • Sima Qian, Burton Watson (trans.). Records of the Grand Historian, vol. 2, Columbia University Press, New York, 1961

Personal communication

  • Haiwang Yuan
  • Vicky Deresa