1. Rifai (private communication).
2. S. Hardjo, N.S. Indrasi, dan T. Bantacut. Biokonversi: Pemanfaatan Limbah Industri Pertanian. [Bioconversion: the utilization of agricultural industry waste] (PAU Pangan dan Gizi IPB, Bogor, 1989), p. 11 [Bahasa Indonesia]
3. M. Hayn, W. Steiner, R. Klinger, H. Steinmuller, M. Sinner and H. Esterbauer, “Basic research and pilot studies on the enzymatic conversion of lignocellulosics” in Bioconversion of Forest and Agricultural Plant Residues, edited by J. N. Saddler (CAB International, Wallingford, 1993), pp. 33–72.
4. Bioconversion of Sugarcane Biomass into Ethanol: An Overview about Composition, Pretreatment Methods, Detoxification of Hydrolysates, Enzymatic Saccharification, and Ethanol Fermentation
5. E. S. Soetarto, “Fermentation Ethanol from Xylooligomers by Yeast,” M.Sc. thesis, School Of Biotechnology UNSW Australia, 1985.