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Muranov, Aleksandr Pavlovich; Greer, Charles E.; Owen, Lewis. "Amur River". Encyclopædia Britannica (online ed.). Archived from the original on 2016-05-21. Retrieved 2016-08-31.
Shih-Shan Henry Tsai, "Perpetual Happiness: The Ming Emperor Yongle". Published by University of Washington Press, 2002. ISBN0-295-98124-5Partial textArchived 2017-01-10 at the Wayback Machine on Google Books. pp. 158-159.