McGraw-Hill, [date of publication not identified]
Buku Teks
Muller, Kal, author
Periplus , 1999
Buku Referensi
Strother, Edgar E.
North-China Daily News and Herald , 1927
Buku Teks
Ingpen, Robert, author
Dragon's World, 1993
Buku Referensi
Cohen, William A., author
American Management Association, 2008
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