al-Qaradawi, Yusuf, author
Dar Al Wahi , 2010
Buku Teks
Niwata, Noriaki
Society of business and commerce, Keio University, 1971
Buku Teks
Chufrin, Gennady, author
Vekas Publishing House, 1976
Buku Teks
Hunter, Shireen, author
M.E. Sharpe, 2004
Buku Teks SO
Aziz, Hassanuddeen Abdul, author
university of Malaya Press, 2010
Buku Teks