Zurryati, Zurryati and Sundari, Rita and Bahrizal, Bahrizal and Putra, Ananda and Latisma DJ, Latisma DJ and Nasra, Edi and Kurniawati, Desy and Nizar, Umar Kalmar   The Effect of Silica-Titania Catalyst Loading on the Production of Biodiesel from Palm and Waste Cooking Oil.  International Journal of Scientific Research and Engineering Development (IJSRED), 2 (3).  pp. 96-101.  ISSN 2581-7175