Gaya APA

PUTERA, R., YOSEF, L. (2015). Assessment of south Africa's preferential procurement policy . Jakarta: Kementrian Perencanaan Pemb Nasional.

Gaya MLA

PUTERA, Rizki., YOSEF, Leila. "Assessment of south Africa's preferential procurement policy". Jakarta: Kementrian Perencanaan Pemb Nasional, 2015. Artikel.