Monro, Donald M., author
Edward Arnold, 1977
Buku Teks
Rice, John K., author
Holt, Rinehart and Winston , 1973
Buku Teks
Nanney, T. Ray, author
Prentice-Hall, 1981
Buku Teks
Hughes, Charles E., author
John Wiley & Sons, 1978
Buku Teks
Nolan, Richard L., author
Addison-Wesley, 1971
Buku Teks