Wan Mohd Zabaria, W.N. et al. 2011. Mekanisme Mata Wang dan Kemeruapan Indikator Ekonomi Dunia: Penilaian Semula ke atas Piawaian Emas: Currency Mechanism and World Economic Volatility Indicator: Reevaluation of Gold Standard. The Journal of Muamalat and Islamic Finance Research. 8, 1 (Jan. 2011), 163–186.