Relawati, R., 		Iriany, A., 		Prihartini, I., & 		Ramli, M.
(2022).
 Farmers’ Willingness to Pay Bio-Activators to Maintain Soil Fertility.
<em>SOCA: Jurnal Sosial Ekonomi Pertanian, 16</em>(3), 234 - 245.
doi:10.24843/SOCA.2022.v16.i03.p01