http://www.truebluenaturalgas.org/orange-county-choppers-for-the-natural-gas-motorheads-out-there
http://www.cngnow.com/EN-US/Vehicles/Pages/ConverttoCNG.aspx
http://devildogdailynews.blogspot.com/2009/06/cng-motorcycle.html
http://thekneeslider.com/archives/2006/04/28/cnglpg-motorcycles-from-bajaj-auto/
http://www.smartcycleshopper.com/motorcycle-news/argentina-cng-motorcycle-ready-for-big-markets/
http://www.treehugger.com/files/2005/02/buenos_aires_mo_1.php
http://green.autoblog.com/2008/12/15/egypt-converting-motorcycles-to-natural-gas/
http://indianautosblog.com/2009/02/cng-motorcycle-from-argentinian-manufacturer-zanella