Thani, Nik Norzrul
Sweet & Maxwell Asia, 2010
Buku Teks
Jackson-Moore, Elisabeth
Global professional , 2009
Buku Teks
Abd aziz Abd Jalal, editor
CERT publications Sdn. Bhd., 2011
Buku Teks
edited by Mohsin S. Khan, Abbas Mirakhor
The institute for research and Islamic Studies, 1987
Buku Teks
Iqbal, Zamir
John Wiley & Sons, 2011
Buku Teks