Yudiansyah, Yudiansyah, et al. “Modification of The Spectrophotometric Analysis Protocol by Sims D. And Gamon to Analyze Leaf Pigment Content Using Green Spinach (Amaranthus Hybridus) As a Model Plant”. Journal of Tropical Crop Science, vol. 11, no. 02, June 2024, pp. 147-54, doi:10.29244/jtcs.11.02.147-154.