1. Prevalence of Helmet Use Among Motorcycle Users in Tamale Metropolis;Ackaah;Ghana: An Observational Study. Traffic Injury Prevention,2010
2. Cross Section and Experimental Data Analysis Using Eviews;Agung,2011
3. Structural equation modeling in practice: A review & recommended two-step approach;Anderson;Psychological Bulletin,1988
4. Statistic Transportation of DKI Jakarta 2016;Badan Pusat Statistik (BPS) DKI Jakarta,2017
5. Badan Pusat Statistik (BPS), 2017. Perkembangan Jumlah Kendaraan Bermotor Menurut Jenis, 1949-2016. Available at https://www.bps.go.id/linkTableDinamis/view/id/1133. [In Bahasa Indonesia]