Hartanto, S., I. N. Ehrich Lister, and E. Fachrial. “A Comparative Study of Peel and Seed Extract of Passion Fruit (Passiflora Edulis) As Anti Collagenase”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 54, no. 1, Mar. 2019, pp. 42-48, https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/4722.