Gonzalez, Javier; Castro, Guillermo Delgado; Garcia-del-Rey, Eduardo; Berger, Carola; Wink, Michael (2009). "Use of mitochondrial and nuclear genes to infer the origin of two endemic pigeons from the Canary Islands". Journal of Ornithology. 150 (2): 357–367. doi:10.1007/s10336-008-0360-4. S2CID24740854.
Gonzalez, Javier; Castro, Guillermo Delgado; Garcia-del-Rey, Eduardo; Berger, Carola; Wink, Michael (2009). "Use of mitochondrial and nuclear genes to infer the origin of two endemic pigeons from the Canary Islands". Journal of Ornithology. 150 (2): 357–367. doi:10.1007/s10336-008-0360-4. S2CID24740854.
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"Madeira". Global Volcanism Program. Smithsonian Institution. Retrieved 20 July 2010