Sam, U. S., M. S. S. Ali, and M. Arsyad. “PERSEPSI PETANI TERHADAP LADA ORGANIK DAN NON ORGANIK”. Jurnal Sosial Ekonomi Pertanian, vol. 14, no. 2, July 2018, pp. 121-32, doi:10.20956/jsep.v14i2.4243.