Porter, Michael E., author
The Free Press , 1990
Buku Teks
Porter, Michael E., author
Tan Xia Wenhua Chuban Gufen You xian Gongsi, 1996
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Yip, George S., author
Prentice-Hall, 1995
Buku Teks
Yip, George S., author
Prentice-Hall, 1992
Buku Teks
Yip, George S., author
Prentice-Hall, 1995
Buku Teks