Sprague, Ralph H., author
Prentice-Hall, 1995
Buku Teks
Saldarini, Robert A., author
Macmillan, 1990
Buku Teks
Saldarini, Robert A., author
Macmillan, 1989
Buku Teks
Kleijnen, Jack P.C.
Addison-Wesley, 1980
Buku Teks
Hussain, K.M., author
Prentice-Hall, 1995
Buku Teks