Dodge, Roy
U.K. Chapman & Hall , 1996
Buku Teks
Budd, Thomas A., author
Alexander Hamilton Institute, 1961
Buku Teks
Parker, R.H.
Penguin Books, 1972
Buku Teks
White, Gerald I., author
John Wiley & Sons, 1994
Buku Teks
Hills, George S., author
Garland Pubishing, 1982
Buku Teks