Valkenburg, P., R. W. Tobey, R. W. Tobey, B. W. Dale, B. W. Dale, B. D. Scotton, B. D. Scotton, J. M. Ver Hoef, and J. M. Ver Hoef. “Body size of female calves and natality rates of known-aged females in two adjacent Alaskan caribou herds, and implications for management”. Rangifer, vol. 23, no. 5, Apr. 2003, pp. 203-9, doi:10.7557/2.23.5.1702.