Asas asas hukum mu'amalat [hukum perdata Islam] - Ahmad Azhar Basyir (Perpustakaan FH. UII, 1993)
ir,c.1/OEN, C.2/ir,c.3/wk, c.4/oen, c.5/ir,c.6/ir,c.7/oen, c.8/ir,c.9-10