Diana, Diana, et al. “Analytical Method Validation of Sildenafil Citrate and Caffeine in Herbal Medicine for Increasing Stamina Using Thin Layer Chromatography - Densitometry”. Proceeding of The International Conference of Inovation, Science, Technology, Education, Children, and Health, vol. 5, no. 1, July 2025, pp. 158-64, doi:10.62951/icistech.v5i1.277.