Warde, Ibrahim, author
Edinburgh University Press, 2000
Buku Teks
Khan, Muhammad Akram, author
Routledge, 2003
Buku Referensi
Visser, Hans G., author
Edward Elgar, 2009
Buku Teks
Hossein Askari, Zamir Iqbal, Noureddine Krichne, Abbas Mirakhor
John Wiley & Sons, 2012
Buku Teks
Hainsworth, Antony, author
LexisNexis, 2009
Buku Teks