Werther, William B., author
Tianxia Wenhua Chuban Gufen Youxian Gongsi, [date of publication not identified]
Buku Teks
Werther, William B., author
Tianxia Wenhua Chuban, 1990
Buku Teks
Werther, William B., author
Tian xia wen hua chu ban gu fen you xian gong si,, 1990
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Kay, Brian R.
McGraw-Hill Book Company, Inc, 1961
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Tagliaferri, Louise E.
John Wiley & Sons, 1979
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