Brandt, Conrad
George Allen and Unwin, 1959
Buku Teks
Hirth, F.
The Statistical Department of The in Pectorate General of Customs, 1888
Buku Referensi
Ho Kan-Chih
Peking: Foreign Language Press, 1959
Buku Teks
Bianco, Lucien
Stanford University Press, 1971
Buku Teks
Franke, Wolfgang
University of South Carolina Press, 1981
Buku Teks