BioStor
 | Commentary on Mr. G.R. Gray's Genera of Birds. 1840 H E Strickland (1841) Annals and Magazine of Natural History 7: 26-41 |
 | May 26, 1863 J E Gray (1863) Proceedings of The Zoological Society of London 1863: 181-224 |
 | On a collection of birds made by Dr. C. Klaesi in the highlands of Padang (W. Sumatra) during the winter 1884-85 J Büttikofer (1887) Notes Leyden Mus. 9: 1-96 |