Ashton, P. S., Kamariah, A. S., & Said, I. M. (2003). A field guide to the forest trees of Brunei Darussalam and the northwest Borneo hotspot. [Brunei Darussalam]: University of Brunei Darussalam in association with Brunei Forestry Department : Brunei Shell Petroleum Co. Sendirian Berhad : Sultan Haji Hassanal Bolkiah Foundation.

Ashton, Peter S., A. S. Kamariah, and Idris Mohd Said. A Field Guide to the Forest Trees of Brunei Darussalam and the Northwest Borneo Hotspot. [Brunei Darussalam]: University of Brunei Darussalam in association with Brunei Forestry Department : Brunei Shell Petroleum Co. Sendirian Berhad : Sultan Haji Hassanal Bolkiah Foundation, 2003.

Ashton, Peter S., A. S. Kamariah, and Idris Mohd Said. A Field Guide to the Forest Trees of Brunei Darussalam and the Northwest Borneo Hotspot. [Brunei Darussalam]: University of Brunei Darussalam in association with Brunei Forestry Department : Brunei Shell Petroleum Co. Sendirian Berhad : Sultan Haji Hassanal Bolkiah Foundation, 2003.