BioStor
 | November 22, 1866 J E Gray (1866) Proceedings of The Zoological Society of London 1866: 417-556 |
 | November 14, 1867 George Busk (1867) Proceedings of The Zoological Society of London 1867: 815-890 |
 | Scientific results of a fourth expedition to forested areas in East and Central Africa. Birds (1942) Bulletin of The Museum of Comparative Zoology 89: 217-275 |