Graham, Robert M., author
John Wiley & Sons, 1975
Buku Teks SO
Bal, Henri, author
Prentice-Hall, 1990
Buku Referensi
Donovan, John J., author
McGraw-Hill, 1972
Buku Teks
Sabot, Gary W., author
MIT Press, 1988
Buku Teks
Beck, Leland L., author
Addison-Wesley, 1985
Buku Teks SO