Walpole, Ronald E., author
Macmillan, 1990
Buku Teks
Walpole, Ronald E., author
Macmillan, 1972
Buku Teks
Walpole, Ronald E., author
Prentice-Hall, 1993
Buku Teks
Walpole, Ronald E., author
Prentice-Hall, 2002
Buku Teks
Montgomery, Douglas C., author
John Wiley & Son, 2003
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