Tham khảo
 Listed as Endangered (EN A1cd+2 cd v2.3)
 Ashton, P.S. Dipterocarpaceae. In Tree Flora of Sabah and Sarawak, Volume 5, 2004. Soepadmo, E., Saw, L.G. and Chung, R.C.K. eds. Government of Malaysia, Kuala Lumpur, Malaysia. ISBN 983-2181-59-3