Tongleaw, S., K. Krisanapook, and L. Phavaphutanon. “Analysis of ‘Khao Yai’ Pummelo Fruit to Estimate Nutrient Losses Through Crop Removal”. Agriculture and Natural Resources, vol. 46, no. 6, Dec. 2012, pp. 827-36, https://li01.tci-thaijo.org/index.php/anres/article/view/242996.