Fried, B. M., R. M. Adams, R. P. Berrens, and O. Bergland. 1995. Willingness to pay for a change in elk hunting quality. Wildlife Society Bulletin 23:680-686.
Thesis
Fried, B. M. 1992. Using valuation functions to estimate changes in the quallity of a recreational experience: elk hunting in Oregon. Corvallis, OR: Oregon State University. 93 pp. M.S. Thesis.