Wongchana, Boonchana, Montree Issarakraiasila, and Somsak Maneepong. “Nitrogen and Zinc on Growth and Nutrient Concentrations in Leaf of Pummelo cv. Kao - thongdee (Citrus maxima (Burm.) Merr ”. Thai Agricultural Research Journal 29, no. 3 (December 31, 2011): 248–261. accessed September 29, 2026. https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/91075.