1. Injuries from motorcycle- and moped crashes in Sweden from 1987–1999;Aare;Inj. Control Saf. Promot.,2003
2. Key Indicators for Asia and the Pacific 2014. Special Chapter: Poverty in Asia–A Deeper Look;ADP (Asian Development Bank),2014
3. AISI (Asosiasi Industri Sepeda Motor Seluruh Indonesia), 2009. Pasar Sepeda Motor Jenuh 2014–2015, Online: http://ekonomi.inilah.com/read/detail/129050/aisi-pasar-sepeda-motor-jenuh-2014-2015#.VClkfhafXVU, (accessed 29.09.14.).
4. From intentions to actions: a theory of planned behavior;Ajzen,1985
5. The theory of planned behavior;Ajzen;Organ. Behav. Human Decis. Processes,1991