Boonchana Wongchana และผู้แต่งคนอื่นๆ. (2011) Nitrogen and Zinc on Growth and Nutrient Concentrations in Leaf of Pummelo cv. Kao - thongdee (Citrus maxima (Burm.) Merr. <i>Thai Agricultural Research Journal</i>, <i>29</i>(3), 248-261.Boonchana Wongchana และผู้แต่งคนอื่นๆ. "Nitrogen and Zinc on Growth and Nutrient Concentrations in Leaf of Pummelo cv. Kao - thongdee (Citrus maxima (Burm.) Merr". Thai Agricultural Research Journal 29 (2011):248-261.Boonchana Wongchana และผู้แต่งคนอื่นๆ. Nitrogen and Zinc on Growth and Nutrient Concentrations in Leaf of Pummelo cv. Kao - thongdee (Citrus maxima (Burm.) Merr. Department of Agriculture:ม.ป.ท. 2011.