Nur Aira Juwita, Urip Harahap, and Aminah Dalimunthe. 2018. “Relaxation Effect of Ethanolic Extract of Picria Fel-Terrae (Pugon Tanoh) Leaves on Contraction of Isolated rat’s Ileum Contracted by Serotonin”. Journal of Innovations in Pharmaceutical and Biological Sciences 5 (1):37-41. https://jipbs.com/index.php/journal/article/view/286.