Smithers, R. H. N.; Stuart Irwin, M. P; Paterson, M. L (1957). "A check List of The Birds of Southern Rhodesia with Data on Ecology and Breeding". The Auk. 74 (1): 513. doi:10.2307/4081763. JSTOR4081763.
Smithers, R. H. N.; Stuart Irwin, M. P; Paterson, M. L (1957). "A check List of The Birds of Southern Rhodesia with Data on Ecology and Breeding". The Auk. 74 (1): 513. doi:10.2307/4081763. JSTOR4081763.