Simbolon, S. H. B., S. Gracia, R. E. Sinaga, and T. Br Sembiring. “Farmers’ Perceptions and Interest Regarding Membership in Merah Putih Village Cooperative in Sempajaya Village”. Contributions of Central Research Institute for Agriculture, vol. 20, no. 3, July 2026, pp. 213-20, doi:10.59651/cceria.v20i3.456.