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Cullen, Christopher (1980). „Joseph Needham on Chinese Astronomy”. Past & Present. 87 (87): 39—53. JSTOR650565. doi:10.1093/past/87.1.39.
Cullen, C. (1976). „A Chinese Eratosthenes of the Flat Earth: A Study of a Fragment of Cosmology in Huai Nan Tzu”. Bulletin of the School of Oriental and African Studies. 39: 106—127. S2CID171017315. doi:10.1017/S0041977X00052137.
Cullen, Christopher (1980). „Joseph Needham on Chinese Astronomy”. Past & Present. 87 (87): 39–53 [p. 42]. JSTOR650565. doi:10.1093/past/87.1.39.
Tattersall, Jill (1981). „Sphere or Disc? Allusions to the Shape of the Earth in Some Twelfth-Century and Thirteenth-Century Vernacular French Works”. The Modern Language Review. 76 (1): 31—46. JSTOR3727009. doi:10.2307/3727009.
Seely, Paul H. (1991). „The Firmament and the Water Above”(PDF). Westminster Theological Journal. 53: 227—40. Архивирано из оригинала(PDF) 05. 03. 2009. г. Приступљено 2. 2. 2010.
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Cullen, Christopher (1980). „Joseph Needham on Chinese Astronomy”. Past & Present. 87 (87): 39—53. JSTOR650565. doi:10.1093/past/87.1.39.
Cullen, Christopher (1980). „Joseph Needham on Chinese Astronomy”. Past & Present. 87 (87): 39–53 [p. 42]. JSTOR650565. doi:10.1093/past/87.1.39.
Tattersall, Jill (1981). „Sphere or Disc? Allusions to the Shape of the Earth in Some Twelfth-Century and Thirteenth-Century Vernacular French Works”. The Modern Language Review. 76 (1): 31—46. JSTOR3727009. doi:10.2307/3727009.
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Cullen, Christopher (1976). „A Chinese Eratosthenes of the Flat Earth: A Study of a Fragment of Cosmology in Huai Nan Tzu”. Bulletin of the School of Oriental and African Studies. 39 (1): 106—127. S2CID171017315. doi:10.1017/S0041977X00052137.
Cullen, C. (1976). „A Chinese Eratosthenes of the Flat Earth: A Study of a Fragment of Cosmology in Huai Nan Tzu”. Bulletin of the School of Oriental and African Studies. 39: 106—127. S2CID171017315. doi:10.1017/S0041977X00052137.
Seely, Paul H. (1991). „The Firmament and the Water Above”(PDF). Westminster Theological Journal. 53: 227—40. Архивирано из оригинала(PDF) 05. 03. 2009. г. Приступљено 2. 2. 2010.