Murray, James D.
O’Reilly & Associates, 1994
Buku Referensi
Hill, Francis S., author
Macmillan, 1990
Buku Teks
Hearn, Donald, author
Prentice-Hall, 1986
Buku Teks
Rogers, David F., 1937-, author
McGraw-Hill , 1990
Buku Teks
Wolfe, R. J., author
Oxford University Press, 2000
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