1. Bamford, J.O.W., 1991. Natural gas as a vehicle fuel in Australia. In: Proceedings of the 1991 International Transport Conference: Transport Shaping Australia — Issues and Opportunities (Brisbane, Qld). National Conference Publication of Institute of Engineers Australia, Barton, AC, vol. 91(4), pp. 181–184
2. Bureau of Infrastructure, Transport and Regional Economics (BITRE), 2009. Road and rail freight: competitors or compliments? Information Sheet 34, BITRE, Canberra.
3. Bouhot, C., 2007. Greenhouse gas emissions and urban public transport. In: Proceedings of the 14th International Union of Air Pollution Prevention and Environmental Protection Associations (IUAPPA), September 9–13, Clean Air Society of Australian and New Zealand, Brisbane.
4. BP, 2008. BP Statistical Review of World Energy, 2008 ed. BP, London.
5. Industry urged to watch for regular oil production peaks, depletion signal;Campbell;Oil and Gas Journal,2003