Orilia, Lawrence, author
John Wiley & Sons, 1972
Buku Teks
McLeod, Raymond, author
John Wiley & Sons, 1982
Buku Teks
Davis, William S., author
Addison-Wesley, 1981
Buku Teks
Boockholdt, James L., author
McGraw-Hill, 1999
Buku Teks
Jakob Andreas Baerentzen, author
Springer-Verlag, 2012
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