REFERENCES
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- McLachlan , C. R. and Liversidge , R. 1957 . Roberts' Birds of South Africa
- Stark , A. and Sclater , W. L. 1900–1906 . The Birds of South Africa
- Smith , Stuart . 1945 . How to study Birds
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- Witherby , H. F. , Jourdain , F. C. R. , Ticehurst , N. F. and Tucker , B. W. 1938 . The Handbook of British Birds, 4