Coblin (2003), p. 353. ——— (2003), "Robert Morrison and the Phonology of Mid-Qīng Mandarin", Journal of the Royal Asiatic Society of Great Britain & Ireland, 13 (3): 339–355, doi:10.1017/S1356186303003134, S2CID162258379.
Coblin (2003), p. 353. ——— (2003), "Robert Morrison and the Phonology of Mid-Qīng Mandarin", Journal of the Royal Asiatic Society of Great Britain & Ireland, 13 (3): 339–355, doi:10.1017/S1356186303003134, S2CID162258379.
Trigault (1953), pp. 28–29. Trigault, Nicholas (1953), China in the Sixteenth Century: The Journals of Matthew Ricci, 1583–1610, trans. by Louis J. Gallagher, New York: Random House, ISBN978-0-7581-5014-1, OCLC491566.