Fraser, Lyn M., author
Prentice-Hall International, 1995
Buku Teks
Parker, R.H.
Penguin Books, 1972
Buku Teks
Foster, Louis O., author
Chelton, 1961
Buku Teks
Budd, Thomas A., author
Alexander Hamilton Institute, 1961
Buku Teks
White, Gerald I., author
John Wiley & Sons, 1994
Buku Teks