↑IUCN, 1995. Rare and Threatened Plants of Indonesia (25 October 1995). IUCN Red Data Book 1995 (Summary).
↑IUCN, 2000. 2000 IUCN Red List of Threatened Species (Compiled by Craig Hilton-Taylor). IUCN Species Survival Commission, Gland, Switzerland and Cambridge, UK.
↑Indonesian Government’s Legislation No, 7, 1999. The Protection of the Indonesian Threatened Plant and Animal Species. Peraturan Pemerintah Republik Indonesia Nomor 7 Tahun 1999 Tentang Pengawetan Jenis Tumbuhan dan Satwa. Jakarta.