Kellner, 2008
Buku Teks
Berninghausen, Jutta
Zed Books Ltd, 1992
Buku Teks
compiled and edited by Emile Woolf
Van Nostrand Reinhold, 1983
Buku Teks
edited by Paul U. Ali, Greg N. Gregoriou
CRC Press, Taylor & Francis Group, 2008
Buku Teks
Clarendon Press, 1994
Buku Teks