University of British Columbia. Programme in Natural Resource Economics., Scott, A., Helliwell, J. F., Lewis, T. R., & Neher, P. A. (1985). Progress in natural resource economics: Essays in resource analysis. Oxford: Clarendon Press.

University of British Columbia. Programme in Natural Resource Economics., Anthony Scott, John F. Helliwell, Tracy R. Lewis, and Philip A. Neher. Progress in Natural Resource Economics: Essays in Resource Analysis. Oxford: Clarendon Press, 1985.

University of British Columbia. Programme in Natural Resource Economics., et al. Progress in Natural Resource Economics: Essays in Resource Analysis. Oxford: Clarendon Press, 1985.