Nowak, Katarzyna, Trevor Jones, and Phyllis Lee. “Using Dung Bolus Diameter for Age Estimation in an Unstudied Elephant Population in Udzungwa Mountains, Tanzania”. Pachyderm 46 (December 31, 2009): 47–52. Accessed April 18, 2024. https://pachydermjournal.org/index.php/pachyderm/article/view/197.