J. M. Kapfer, “Chasing Bullsnakes (Pituophis catenifer sayi) in Wisconsin: On the Road to Understanding the Ecology and Conservation of the Midwest’s Giant Serpent”, iguana, vol. 15, no. 4, pp. 190–197, Dec. 2008, Accessed: Apr. 22, 2025. [Online]. Available: https://journals.ku.edu/iguana/article/view/17900