Ismail, Sjarif, et al. “Mechanism of Vasorelaxation Induced by Coptosapelta Flavescens Stems Extract in Rat Thoraric Aorta”. Journal of Tropical Pharmacy and Chemistry, vol. 4, no. 2, Dec. 2017, pp. 96-102, doi:10.25026/jtpc.v4i2.146.