Purwanto, A., H. Hadayani, and R. Amtira. “Analisis Pendapatan Usahatani Kakao Di Desa Lambunu Utara Kecamatan Bolano Lambunu Kabupaten Parigi Moutong”. AGROTEKBIS : JURNAL ILMU PERTANIAN (e-Journal), Vol. 7, no. 1, Feb. 2019, pp. 59-66, http://103.245.72.23/index.php/agrotekbis/article/view/383.