BioStor
 | June 17, 1873 Viscount Walden (1873) Proceedings of The Zoological Society of London 1873: 554-682 |
 | A collection of birds from the Provinces of Yunnan and Szechwan, China, made for the National Geographic Society by Dr. Joseph F. Rock J H Riley (1926) Proceedings of The United States National Museum 70: 1-70 |
 | A second collection of birds from the provinces of Yunnan and Szechwan, China, made for the National Geographic Society by Dr. Joseph F. Rock J H Riley (1931) Proceedings of The United States National Museum 80: 1-91 |
 | The palatine process of the premaxilla in the Passeres; a study of variation, function, evolution and taxonomic value of single character throughout an avian order W J Bock (1960) Bulletin of The Museum of Comparative Zoology 122: 359-488 |