1. http://www.swov.nl/rapport/Factsheets/UK/FS_Vulnerable_road_users.pdf
2. http://www.swov.nl/rapport/factsheets/uk/fs_pedestrians.pdf
3. http://apps.who.int/iris/bitstream/10665/189242/1/9789241565066_eng.pdf?ua=1
4. https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/812124
5. Statistical Report of Road Accidents 2013 (Royal Malaysian Police, Traffic Branch, Bukit Aman, Kuala Lumpur, 2014)