Froberg, Carl-Erik, author
Addison-Wesley, 1972
Buku Teks
Stoer, Josef, author
Springer-Verlag, 1993
Buku Teks
Cullen, Charles G., author
PWS Publishing, 1994
Buku Teks
Grove, Wendell E.
Prentice-Hall, 1966
Buku Teks
Norris, A.C., author
John Wiley & Sons, 1981
Buku Teks