1. Anonymous (2011) http://en.wikipedia.org/wiki/Biodiesel
2. Ebert J (2007) Biodies Mag 4:1–3
3. McIntyre C (2007) http://www.de.endress.com/eh/central/info/resource.nsf/imgref/Download_WP-2007-Biodiesel.pdf/$FILE/WP-2007-Biodiesel.pdf
4. Anonymous (2011) http://en.wikipedia.org/wiki/Glycerol
5. Lines S (2009) http://snrecmitigation.wordpress.com/2009/04/19/an-exploding-market-utilizing-waste-glycerol-from-the-biodiesel-production-process