Gaya APA

Purba, J, H, V. (2008). Model Ekonometrika Minyak Sawit (Crude Palm Oil) Indonesia . : Kesatuan Press.

Gaya MLA

Purba, Jan, Horas, Veryady. "Model Ekonometrika Minyak Sawit (Crude Palm Oil) Indonesia". : Kesatuan Press, 2008. Text.