Marquand, John P.
Pocket Books , 1937
Buku Teks
Marquand, John P
New York : Pocket Books, 1940
Buku Teks
Solomon, Louis
CRC Press, 2014
Buku Teks
edited by Jack A. Goldstone, Ted Robert Gurr, Farrokh Moshiri
Westview Press, 1991
Buku Teks
Astley, Thea
Univrsity of Queensland Press, 1984
Buku Teks