Ray, Haraprasad (1987b). "The Eighth Voyage of the Dragon that Never Was: An Enquiry into the Causes of Cessation of Voyages During Early Ming Dynasty". China Report. 23 (2): 157–178. doi:10.1177/000944558702300202. S2CID155029177.
Ray, Haraprasad (1987b). "The Eighth Voyage of the Dragon that Never Was: An Enquiry into the Causes of Cessation of Voyages During Early Ming Dynasty". China Report. 23 (2): 157–178. doi:10.1177/000944558702300202. S2CID155029177.