CULLEN, Christopher. The Science/Technology Interface in Seventeenth-Century China: Song Yingxing 宋 應 星 on "qi" 氣 and the "wu xing" 五 行. Bulletin of the School of Oriental and African Studies, University of London. 1990, roč. 53, čís. 2, s. 295–318. Dostupné online. doi:10.1017/S0041977X00026100.
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CULLEN, Christopher. The Science/Technology Interface in Seventeenth-Century China: Song Yingxing 宋 應 星 on "qi" 氣 and the "wu xing" 五 行. Bulletin of the School of Oriental and African Studies, University of London. 1990, roč. 53, čís. 2, s. 295–318. Dostupné online. doi:10.1017/S0041977X00026100.