Wang, F.S., Roddick, F.A., Boontanjai, C., Kosier, E. and Richardson, A.J. (1991). "Systematic Optimization of the Recycling of Beverage Containers". Waste Management and Environment, 3(1), pp. 25-27.

Richardson, A.J. (1991). "Variability in Travel Patterns over Two Days". Paper presented to 13th Conference of Australian Institutes of Transport Research, University of Queensland.