Sabine, George H., author
Henry Holt , 1954
Buku Teks
Disch, Thomas M., author
Free Press, 1998
Buku Teks
Broad, C.D., author
Littlefield, Adams, 1959
Buku Teks
Losco, Joseph, author
Radja Grafindo Persada, 2005
Buku Teks
Varma, S.P., author
Radja Grafindo Persada, 2003
Buku Teks