Seyock, Barbara: Zeitschrift der Deutschen Morgenländischen Gesellschaft / Hu Wei's "Map of the Four Seas" and its sigificance for Yama'ichi research, 2014
 

Zeitschrift der Deutschen Morgenländischen GesellschaftBd. 149 (1999)Hu Wei's "Map of the Four Seas" and its sigificance for Yama'ichi research