1. American Academy of Pediatrics. (1994). The child as a passenger on an adult's bicycle. Retrieved November 29, 2007, from http://www.aap.org/family/tippadultbike.htm.
2. Bicycle Helmet Safety Institute. (2004). Helmet related statistics. Retrieved November 21, 2007, from http://www.helmets.org.
3. Chariot Carriers. (2007). Full product line. Retrieved October 1, 2008, from http://www.chariotcarriers.com/english/html/full_product_line.php.
4. Grant, S. (2006). Trailbikes. Retrieved November 21, 2007, from http://www.helmets.org/trailbikes.htm.
5. International Bicycle Fund. (n.d.). Infant/baby/kid; bicycle, trailer, backpack, child carrier, helmet & bike safety. Retrieved December 5, 2007, from http://www.ibike.org/education/infant.htm.