Motorized bicycle (English Wikipedia)

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TMR Queensland (2010-09-20). "Legal vehicles that do not require registration". Transport and Main Roads, Queensland. Archived from the original on 2011-03-04. Retrieved 2010-09-25.

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vicroads (January 2000). Summary of Registration Requirements for Motorcycles and Mopeds (PDF). Vehicles standards information. 60 Denmark Street, Kew, 3101: Vehicle Safery Branch, vicroads. p. 4. Archived from the original (PDF) on 2011-04-06. Retrieved 2010-09-25.{{cite conference}}: CS1 maint: location (link)

Depuydt, Filiep. "Minerva Motorcyclettes, 1900–1909: History". Archived from the original on 2 October 2011. Retrieved 19 April 2011.
Mitchell, Leon, 1903 California Specifications Archived 2011-03-01 at the Wayback Machine, Leon's Vintage Motorcycle Page, 1998-2002
Current US Motorcycle and Bicycle Helmet Laws Archived 2010-12-12 at the Wayback Machine, Insurance Institute For Highway Safety, December 2010
vicroads (January 2000). Summary of Registration Requirements for Motorcycles and Mopeds (PDF). Vehicles standards information. 60 Denmark Street, Kew, 3101: Vehicle Safery Branch, vicroads. p. 4. Archived from the original (PDF) on 2011-04-06. Retrieved 2010-09-25.{{cite conference}}: CS1 maint: location (link)
TMR Queensland (2010-09-20). "Legal vehicles that do not require registration". Transport and Main Roads, Queensland. Archived from the original on 2011-03-04. Retrieved 2010-09-25.