Roulen, M. “Inquiries Respecting Certain Changes Observed to Have Taken Place in Domestic Animals Transported from the Old to the New Continent”. South African Quarterly Journal 1, no. 3 (June 30, 1830): 271–276. Accessed November 20, 2025. https://journal.ru.ac.za/index.php/saqj/article/view/2650.