Rimando, Agnes M.; Han, Byung Hoon; Park, Jeong Hill; Cantoria, Magdalena C. (1986). "Studies on the constituents of Philippine Piper betle leaves". Archives of Pharmacal Research. 9 (2): 93–97. doi:10.1007/BF02857217. ISSN0253-6269. S2CID98263258.
Rimando, Agnes M.; Han, Byung Hoon; Park, Jeong Hill; Cantoria, Magdalena C. (1986). "Studies on the constituents of Philippine Piper betle leaves". Archives of Pharmacal Research. 9 (2): 93–97. doi:10.1007/BF02857217. ISSN0253-6269. S2CID98263258.
Rimando, Agnes M.; Han, Byung Hoon; Park, Jeong Hill; Cantoria, Magdalena C. (1986). "Studies on the constituents of Philippine Piper betle leaves". Archives of Pharmacal Research. 9 (2): 93–97. doi:10.1007/BF02857217. ISSN0253-6269. S2CID98263258.