Narayanan, R. S., author
Spon Press, 2001
Buku Teks
Gupta, Vijay, author
Tata McGraw-Hill, 1980
Buku Teks
edited by D. Henry Edel
Prentice-Hall, 1967
Buku Teks
Karsnitz, John R., author
Delmar Cengage Learning, 2013
Buku Teks
Marcovitz, Alan B.
McGraw-Hil, 2002
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