Yimpak , Kulapat, Nattaporn Prakongkep, และ Worachart Wisawapipat. 2025. “Effect of bio-extracts on soil properties and tea-oil camellia (Camellia oleifera) yield grown in a mountainous area of northern Thailand”. วารสารแก่นเกษตร 53 (2):382-404. https://li01.tci-thaijo.org/index.php/agkasetkaj/article/view/262213.