Sharma, H. D., author
IBH Publishing, 1988
Buku Teks
Parris, Melanie, author
McGraw-Hill, 2012
Buku Teks
Freivalds, Andris, author
McGraw-Hill, 2014
Buku Teks
Goodwin, Leonard, author
The Brookings Institution, 1972
Buku Teks
Fracchia, Charles A., 1937-, author
Penguin Books, 1979
Buku Teks