Journal of the North China Branch of the Royal Asiatic Society, vol. XXXV (1903-1904), pp. 21-25.
http://purl.library.uoregon.edu/e-asia/ebooks/read/standards.lit
Eugene, OR: e-Asia, 2006
http://purl.library.uoregon.edu/e-asia/ebooks/read/dull-1CHIN.pdf