Oktarina, Yetty, Angga Sebagustionnes, and Mukhlis Mukhlis. 2024. “Coffee Farmers’ Obligations Response to 4C Certification in South OKU Regency South Sumatra Province, Indonesia”. Agro Bali : Agricultural Journal 7 (2):488-99. https://doi.org/10.37637/ab.v7i2.1788.