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Dyfyniad MLASobary, Mohamad. Piety and Economics Behavior A Study of The Informal Sector in Surabya, West Java = Kesalehan Dan Tingkah Laku Ekonomi. Yayasan Bentang Budaya, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.