APA Style

et.al., ., Subagyo, P. (2013). Dasar-Dasar Operation Research (ed. 2). Yogyakarta: BPFE.

MLA Style

et.al., ., Subagyo, Pangestu. "Dasar-Dasar Operation Research". ed. 2 Yogyakarta: BPFE, 2013. Text.