Ken Gewurtz, "Yenching: The Singular History of A Singular Library," Harvard Gazette"Harvard Gazette: Yenching". Archived from the original on December 11, 2006. Retrieved December 8, 2006.
"Institute of Geographical Exploration: 1929-1952", Collection of Historical Scientific Instruments, Harvard University [1]
Ken Gewurtz, "Yenching: The Singular History of A Singular Library," Harvard Gazette"Harvard Gazette: Yenching". Archived from the original on December 11, 2006. Retrieved December 8, 2006.