References
- 1851 . Murrayand Annals, vol. xii. p. 58.
- 1830 . i Jan. : 243 – 243 .
- No. 17. Art. 17.
- No. 17. Art. 17.
- No. 17. Art. 17.
- Jard. and Selb. 1830 . Illustrations of Ornithology . Jan. : 245 – 245 . byand
- 1851 . Sketch of Madeira 123 – 123 . Murray