Gaya APA

Isa, ', Q., Harahap, K, A, . (2005). Hakekat Tasawuf (Cet. 2). Jakarta: Qisthi Press.

Gaya MLA

Isa, 'Abdul, Qadir., Harahap, Khairul, Amru, . "Hakekat Tasawuf". Cet. 2 Jakarta: Qisthi Press, 2005. Text.