Balje, O. E., author
Wiley, 1981
Buku Referensi
Astrom, Karl J. (Karl Johan), 1934-, author
Prentice Hall International, 1997
Buku Teks
Macginley, T. J., author
E & FN Spon, 1990
Buku Teks
Chatterson, Paul A., author
Wiley, 1992
Buku Teks
Pittman, Thomas, author
Prentice-Hall, 1992
Buku Teks