Tooley, Desmond Francis, author
Gower Press, 1973
Buku Teks
Bradshaw, Vaughn, author
John Wiley & Sons, 1993
Buku Teks
Anthony, Robert N. (Robert Newton), 1916-2006, author
McGraw-Hill, 2001
Buku Teks
Nise, Norman S.
John Wiley & Son, 2004
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Dorf, Richard C., author
Pearson Prentice Hall, 2005
Buku Teks