Temitope Olabisi Abodunrin, and Yemisi T. Afolabi, trans. “Assessment of the Effect of Glycine, Oxalic Acid and Nitrogen-Phosphorus-Potassium (NPK) Fertilizer As Nutrient Supplement Using Phosphate and OxalicAcid As Indices”. Pakistan Journal of Analytical & Environmental Chemistry 21, no. 1 (June 28, 2020): 102 – 106. Accessed November 5, 2025. https://pjaec.pk/index.php/pjaec/article/view/127.