Peltzer, Karl, and Supa Pengpid. “Helmet Use and Associated Factors Among Motorcyclists in the Association of Southeast Asian Nations: Prevalence and Effect of Interventions”. Social and Health Sciences 12, no. 1 (2014): 72–86. Accessed July 22, 2024. https://unisapressjournals.co.za/index.php/SaHS/article/view/13759.