Haeger, John W. (1978). «Marco Polo in China? Problems with Internal Evidence». Bulletin of Sung and Yüan Studies. 14: 22–30. JSTOR23497510
Franke, Herbert (1966). «Sino-Western Contacts Under the Mongol Empire». Journal of the Hong Kong Branch of the Royal Asiatic Society. 6: 49–72. JSTOR23881433
Francis Woodman Cleaves (1976). «A Chinese Source Bearing on Marco Polo's Departure from China and a Persian Source on his Arrival in Persia». Harvard Journal of Asiatic Studies. 36: 181–203. JSTOR2718743
Morgan, D.O (julho de 1996). «Marco Polo in China-Or Not" 221-225». The Journal of the Royal Asiatic Society. 6 (2): 224. JSTOR25183182
Bram 1983. Bram, Leon L.; Robert S., Phillips; Dickey, Norma H. (1983), Funk & Wagnalls New Encyclopedia, ISBN978-0-8343-0051-4 (em inglês), Nova Iorque: Funk & Wagnalls (Artigo publicado em 2006 pela World Almanac Books, disponível online em History.com)