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| เอกสารอ้างอิง | Li, B., A.J.M. Leeuwenberg and D.J. Middleton. (1995). Apocynaceae. In Flora of China Vol. 16: 162–163. |
Middleton, D.J. (2004). A revision of Kopsia (Apocynaceae: Rauvolfioideae). Harvard Papers in Botany 9(1): 89–142. | |
Middleton, D.J. (1999). Apocynaceae. In Flora of Thailand Vol. 7(1): 60–64. |