1. Abdelilah, K. & Damien, S. 2018. Vehicle Type-Approval and Road Worthiness Test in Togo [Online]. Togo Directorate for Road and Rail Transport. Available: https://citainsp.org/wp-content/uploads/2018/07/TogoReportFinalEN.Final_.pdf [Accessed 27 November 2020].
2. Abdelilah, K., Damien, S. & Sogodel, V. 2019. Mission Report: Assessment Vehicle Inspecton Systems [Online]. International Motor Vehicle Inspection Committee (CITA). Available: https://citainsp.org/wp-content/uploads/2020/07/Report_AVIS_Cameroun_final.pdf [Accessed 27 November 2020].
3. ADB. 2018. Somalia Transport Sector Needs Assessment and Investment Programme [Online]. Abidjan: African Development Bank Group. Available: https://www.afdb.org/fileadmin/uploads/afdb/Documents/Publications/Somalia_Transport_Sector_Needs_Assessment_and_Investment_Programme.pdf [Accessed 3 November 2020].
4. Nigeria's imported fuel more toxic than black market supply [Online];Africa News;Africa News,2020
5. ANAS, A. 2018. Fuel Quality and Emission Standard Developments in Africa [Online]. Nairobi: UN Environment. Available: https://wedocs.unep.org/bitstream/handle/20.500.11822/25233/FuelQualityEmissionStandardDevelopments.pdf?sequence=3&isAllowed=y [Accessed 3 December 2020].