Levathes, Louise (1994), When China Ruled the Seas: The Treasure Fleet of the Dragon Throne, 1405–1433, Oxford University Press, pp. 125–126, 220n, ISBN0-19-511207-5. Her source is
Fletcher, Joseph F. (1968), "China and Central Asia, 1368–1884", in Fairbank, John King (ed.), The Chinese world order: traditional China's foreign relations, Volume 32 of Harvard East Asian series, Harvard University Press, p. 211, who in his turn cites a translation of the Persian text of Yongle's letter from a Samarkand ca. 1475 source
González de Clavijo, Ruy; Estrada, Francisco López (1999), Embajada a Tamorlán, Volume 242 of Clásicos Castalia Series (in Spanish), Editorial Castalia, p. 19, ISBN84-7039-831-8, archived from the original on 2020-08-11, retrieved 2022-05-21
González de Clavijo, Ruy; Estrada, Francisco López (1999), Embajada a Tamorlán, Volume 242 of Clásicos Castalia Series (in Spanish), Editorial Castalia, p. 19, ISBN84-7039-831-8, archived from the original on 2020-08-11, retrieved 2022-05-21