Visser, Hans G.
Edward Elgar, 2009
Buku Teks
Muhammad Ayub
John Wiley & Sons Inc., 2010
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Al-Suwailem, Sami
Islamic Development Bank,, 2006
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Lahsasna, Ahcene
CERT, 2010
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Zamir Iqbal and Abbas Mirakhor, Editors
The World Bank, 2013
Buku Teks