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2. Falk D (2008) In Search of Time: the Science of a Curious Dimension. McClelland & Stewart, Toronto
3. Zheng XZ (2017) Pan-gu Sandglass and Its Evolution, HuaXiaWenMing, vol. 3. 鄭學忠, (2017). 盤古沙漏及其演變,華夏文明
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5. Wang Z 1300 s, The book of Agriculture, Modern republished in 1991, Zhonghua Book Company, Beijing. (in Chinese) 王禎, 1300 s,農書. (近代發行: 1991,中華書局,北京.)