Muhammad Syafiq Shahari, Anisah Fathin Ismail, Endang Kumolosasi, Nor Fadilah Rajab, and Khairana Husain, “Isolation of indole alkaloids from Kopsia larutensis King & Gamble and their effects on histamine and β-hexosaminidase inhibitory in RBL-2H3 cell line”, J Inn Pharm Bio Sci, vol. 4, no. 3, pp. 80–86, Jul. 2017.