“Willingness to Pay and Factors Affecting the Income of Rice and Corn Farmers in the Use of Superior Seeds in North Raman Sub District: IPB University”. Jurnal Ekonomi Dan Kebijakan Pembangunan, vol. 11, no. 2, Dec. 2022, pp. 161-74, https://doi.org/10.29244/jekp.11.2.2022.161-174.