Gaya APA

Siahaya, W. (2012). Manajemen pengadaan procurement management academic, business, goverment/ Willem Siahaya (Cet.1). Bandung: Alfabeta.

Gaya MLA

Siahaya, Willem. "Manajemen pengadaan procurement management academic, business, goverment/ Willem Siahaya". Cet.1 Bandung: Alfabeta, 2012. Text.