M. S. Hasibuan, S. Yasni, M. Bintang, and A. S. Ranti, “Antihyperglycemic Activity of Piper crocatum Leaves and Cinnamomum burmannii Bark Mixture Extract in Streptozotocin-induced Diabetic Rats”, J. Math. Fund. Sci., vol. 48, no. 2, pp. 178-191, Aug. 2016.