Gaya APA

Umar, M, A, C. (1979). Alam Kubur : Alam Barzakh . Singapore: C.V. Toha Putra.

Gaya MLA

Umar, M., Ali, Chasan. "Alam Kubur : Alam Barzakh". Singapore: C.V. Toha Putra, 1979. Text.