Gaya APA

D., F, N., Ishartadi, A. (2019). The Guide Book Of SOP (Cet. 1). Yogyakarta: Quadrant.

Gaya MLA

D., Fajar, Nur'aini., Ishartadi, Arif. "The Guide Book Of SOP". Cet. 1 Yogyakarta: Quadrant, 2019. Text.