Simpkin, Marshall, Hamilton, Kent, , 1923
Buku Teks
University of Chicago Press, 1937
Buku Teks
The North-China Daily News & Herald,, 1933
Buku Teks
Woodhead, C. B. E.
North-Chine Daily News and Herald, , 1936
Buku Teks
The North-China Daily News & Herald,, 1934
Buku Teks