Larter, Nicholas C., and John A. Nagy. “Overwinter changes in urea nitrogen:creatinine and cortisol:creatinine ratios in urine from Banks Island Peary caribou”. Rangifer 20, no. 5 (April 1, 2000): 125–132. Accessed April 19, 2025. https://new.eludamos.org/index.php/rangifer/article/view/1637.