KARMAN, Joni; 						SUPARWOTO, Suparwoto; 						HUTAPEA, Yanter.
 The Productivity and Income of Corn Farming Business through the Application of Biological Fertilizers.
<strong>SOCA: Jurnal Sosial Ekonomi Pertanian</strong>, [S.l.], v. 14, n. 3, p. 430 - 440, june 2020.
ISSN 2615-6628.
Available at: &lt;<a href="http://103.29.196.112/index.php/soca/article/view/58532" target="_new">http://103.29.196.112/index.php/soca/article/view/58532</a>&gt;. Date accessed: 16 dec. 2025.
doi: <a href="https://doi.org/10.24843/SOCA.2020.v14.i03.p05">https://doi.org/10.24843/SOCA.2020.v14.i03.p05</a>.