Calvin, Robert J., author
McGraw-Hill, 2000
Buku Teks
Colley, John L., author
McGraw-Hill, 2001
Buku Teks
Abu Hilwa Aijawa, author
Restu Agung, 2005
Buku Teks
Still, Richard R
Prentice Hall International, 1988
Buku Teks
Jones, John G., author
Alexander Hamilton Institute, 1961
Buku Teks