Abdul Ghani Memon et al.trans. 2020. Development of Colorimetric Method for the Quantitative Analysis of Amlodipine Besylate in Dosage Form Using 4-Dimethyleaminobenzaldehyde as Derivatizing Reagent. Pakistan Journal of Analytical & Environmental Chemistry. 21, 1 (Jun. 2020), 27 – 33. DOI:https://doi.org/10.21743/pjaec/2020.06.04.