www.journeytoforever.org/biodiesel_svo.html
www.earthship.net
www.biodieseldiscussion.com/
www.oilburners.net/
ctbiodzl.freeshell.org/votdi.html
www.vegetableoildiesel.co.uk/fuelsdatabase/database/index.php
www.journeytoforever.org/biodiesel_SVO-Allen.html
www.journeytoforever.org/biodiesel_TDI.html
dudadiesel.com/
www.elsbett.com/us/about-us/introduction.html