Iqbal, M. N., 和 A. Ashraf. 《Influence of Feeding Strategy and Bill Trimming on Progression of Health and Behavior in Mule Ducks》. PSM Veterinary Research, 卷 7, 期 1, 2022年6月, 页 69-71, https://psmjournals.org/index.php/vetres/article/view/656.