FRANKE-BRYSON, U. Tip of the iceberg: hybrid Cape Sparrow and Great Sparrow in Namibia. Biodiversity Observations, [S. l.], v. 7, p. 1–6, 2016. Disponível em: https://journals.uct.ac.za/index.php/BO/article/view/375. Acesso em: 29 may. 2022.