Cunningham, Peter, and Neil Thomson. “Southern Double-Collared Sunbird Cinnyris Chalybeus and Malachite Sunbird Nectarinia Famosa Presence in Southern Namibia”. Biodiversity Observations 7 (March 1, 2016): 1–4. Accessed June 30, 2022. https://journals.uct.ac.za/index.php/BO/article/view/307.