Chang 1974. Chang, Kuei-Sheng (July–September 1974). "The Maritime Scene in China at the Dawn of Great European Discoveries". Journal of the American Oriental Society. 94 (3): 347–359. doi:10.2307/600069. JSTOR600069.
Yen Ch'ung-chien. Ch'u-yü chou-chih lu, Vol. III, ch. 8, 25. National Palace Museum (Peiping), 1930. Cited in Chang (1974). Chang, Kuei-Sheng (July–September 1974). "The Maritime Scene in China at the Dawn of Great European Discoveries". Journal of the American Oriental Society. 94 (3): 347–359. doi:10.2307/600069. JSTOR600069.
Wake 1997, p. 58. Wake, Christopher (December 1997). "The Great Ocean-Going Ships of Southern China in the Age of Chinese Maritime Voyaging to India, Twelfth to Fifteenth Centuries". International Journal of Maritime History. 9 (2): 51–81. doi:10.1177/084387149700900205. S2CID130906334.
Lewis 1973, p. 248. Lewis, Archibald (December 1973), "Maritime Skills in the Indian Ocean 1368–1500", Journal of the Economic and Social History of the Orient, 16 (2/3): 238–264, doi:10.2307/3596216, JSTOR3596216
Chang 1974. Chang, Kuei-Sheng (July–September 1974). "The Maritime Scene in China at the Dawn of Great European Discoveries". Journal of the American Oriental Society. 94 (3): 347–359. doi:10.2307/600069. JSTOR600069.
Yen Ch'ung-chien. Ch'u-yü chou-chih lu, Vol. III, ch. 8, 25. National Palace Museum (Peiping), 1930. Cited in Chang (1974). Chang, Kuei-Sheng (July–September 1974). "The Maritime Scene in China at the Dawn of Great European Discoveries". Journal of the American Oriental Society. 94 (3): 347–359. doi:10.2307/600069. JSTOR600069.
Lewis 1973, p. 248. Lewis, Archibald (December 1973), "Maritime Skills in the Indian Ocean 1368–1500", Journal of the Economic and Social History of the Orient, 16 (2/3): 238–264, doi:10.2307/3596216, JSTOR3596216
Wilson, Samuel M. "The Emperor's Giraffe", Natural History Vol. 101, No. 12, December 1992 "Archived copy". Archived from the original on 2 December 2008. Retrieved 14 April 2012.{{cite web}}: CS1 maint: archived copy as title (link)
Wake 1997, p. 58. Wake, Christopher (December 1997). "The Great Ocean-Going Ships of Southern China in the Age of Chinese Maritime Voyaging to India, Twelfth to Fifteenth Centuries". International Journal of Maritime History. 9 (2): 51–81. doi:10.1177/084387149700900205. S2CID130906334.
Wilson, Samuel M. "The Emperor's Giraffe", Natural History Vol. 101, No. 12, December 1992 "Archived copy". Archived from the original on 2 December 2008. Retrieved 14 April 2012.{{cite web}}: CS1 maint: archived copy as title (link)
Needham 1971, pp. 460–470. Needham, Joseph (1971). Science and Civilization in China. Vol. 4, Physics and physical technology. Part III, Civil engineering and nautics. Cambridge, England: Cambridge University Press. OCLC634783184.
Needham 1971, p. 481. Needham, Joseph (1971). Science and Civilization in China. Vol. 4, Physics and physical technology. Part III, Civil engineering and nautics. Cambridge, England: Cambridge University Press. OCLC634783184.