Abs, Michael; Pascal Eckhoff; Jürgen Fiebig & Sylke Frahnert (2010). «The bird collections in the Museum für Naturkunde Berlin resulting from Ernst Schäfer's three expeditions to Tibet and Sikkim». Zoosystematics and Evolution. 86 (1): 49–80. doi:10.1002/zoos.200900014 !CS1 manut: Nomes múltiplos: lista de autores (link)