Fatimah, F., H. Hadayan, and Y. Yulianti. “Analisis Perilaku Harga Cpo (Crude Palm Oil) Pada Perusahaan Pt. Pasangkayu Sulawesi Barat”. AGROTEKBIS : JURNAL ILMU PERTANIAN (e-Journal), Vol. 5, no. 2, Apr. 2017, pp. 243 -48, http://518849.wannyin.cyou/index.php/agrotekbis/article/view/133.