Novayanti, N., Fifian Permata Sari, Achmad Tarmizi and Anggi Fatmayati (2023) “UPPB INSTITUTIONAL PERFORMANCE ANALYSIS ON RUBBER TRADING SYSTEM IN SOUTH SUMATERA”, International Journal of Social Science, 2(5), pp. 2107–2114. doi: 10.53625/ijss.v2i5.4818.