1. Syahrial, Ego., Adam, Rinaldi., Suharyati, Ajiwihanto, Nunung., Indarwati, R.R. Fifi., Kurniawan, Feri., Kurniawan, Agung. dan Suzanti, Vony Mela. Handbook of Energy & Economic Statistics of Indonesia. 8th ed. Jakarta: Kementrian ESDM; 2011.
2. Knothe, Gerpen, Jon Van., Krahl, Jürgen. The Biodiesel Handbook, 9-10, Champaign, Illinois USA: AOCS Press; 2005.
3. Parhusip, Adhy Basar. Potret Karet Alam Indonesia. Economic Review. 2008.
4. Ramadhas, A.S., Jayaraj, S., Muraleedharan, C. Biodiesel production from high FFA rubber seed oil, Elsevier Ltd, 0016-2361/$, 335-339. 2005.
5. Furukawa, S., Uehara, Y., Yamasaki, H. Variables affecting the reactivity of acid-catalyzed transesterification of vegetable oil with methanol. Bioresour. Technol. 2010; 101:3325-3332.