Needham, Joseph (1954), Science and Civilisation in China, 1–5, New York: Cambridge University Press, s. 38, 3 Nisan 2024 tarihinde kaynağından arşivlendi, erişim tarihi: 3 Nisan 2024, with the research assistance of Wang Ling
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Needham, Joseph (1954), Science and Civilisation in China, 1–5, New York: Cambridge University Press, s. 38, 3 Nisan 2024 tarihinde kaynağından arşivlendi, erişim tarihi: 3 Nisan 2024, with the research assistance of Wang Ling