Hendri Faisal et al.trans. 2022. Analysis of Vitamin C Levels and Evaluation of Effervescent Tablets Mixture of Ethanol Extract of Red Guava Seeds and White Guava Seeds (Psidium Guajava L.). Jurnal Indah Sains dan Klinis. 3, 1 (Apr. 2022), 1–7. DOI:https://doi.org/10.52622/jisk.v3i1.40.