Battistini, Pierluigi (1997-08-26). "65. Geographical map by Matteo Ricci". Museo della Specola, Catalogue, maps. Bologna: University of Bologna. Retrieved 14 January 2010.
books.google.com
Japan and China: mutual representations in the modern era Wataru Masuda p.17 [1]
Rothstein, Edward (2010-01-19). "Map That Shrank the World". New York Times, Arts, Exhibition Review. New York: The New York Times Company. Retrieved 20 January 2010.