1. Achtnicht, M., Buehler, G., Hermeling, C., 2008. Impact of Service Station Networks on Purchase Decisions of Alternative-Fuel Vehicles. Discussion Paper No. 08-088. 〈http://papers.ssrn.com/sol3/papers.cfm?abstract-1298937〉.
2. Ampofo, K., 2010. Ghana's Worsening LPG Shortages: What to do? Retrieved from www.ghanabusinessnews.com on 27/7/2011.
3. Asamoah, E., 2008. Meeting the Demand for Petroleum Products in Year 2020: What is the Road Map for Ghana? A Thesis Submitted to Centre for Energy, Petroleum and Mineral Law and Policy, University of Dundee, Scotland, UK.
4. Investigating the effects of LPG on spark ignition engine combustion and performance;Bayraktar;Energy Conversion and Management,2005
5. Fuel-cycle greenhouse gas emissions from alternative fuels in Australian heavy vehicles;Beer;Atmospheric Environment,2002