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OLSON, Storrs L. Birds, including extinct species, encountered by the Malaspina Expedition on Vava'u, Tonga, in 1793. Archives of Natural History. 2006-4, roč. 33, čís. 1, s. 42–52. Dostupné online [cit. 2019-03-22]. ISSN0260-9541. doi:10.3366/anh.2006.33.1.42. (anglicky)
euppublishing.com
OLSON, Storrs L. Birds, including extinct species, encountered by the Malaspina Expedition on Vava'u, Tonga, in 1793. Archives of Natural History. 2006-4, roč. 33, čís. 1, s. 42–52. Dostupné online [cit. 2019-03-22]. ISSN0260-9541. doi:10.3366/anh.2006.33.1.42. (anglicky)
iucnredlist.org
The IUCN Red List of Threatened Species 2021.3. 9. prosince 2021. Dostupné online. [cit. 2021-12-27].
jhu.edu
muse.jhu.edu
STEADMAN, David W. A New Species of Extinct Parrot (Psittacidae: Eclectus ) from Tonga and Vanuatu, South Pacific. Pacific Science. 2006, roč. 60, čís. 1, s. 137–145. Dostupné online [cit. 2019-03-22]. ISSN1534-6188. doi:10.1353/psc.2005.0061. (anglicky)
worldcat.org
STEADMAN, David W. A New Species of Extinct Parrot (Psittacidae: Eclectus ) from Tonga and Vanuatu, South Pacific. Pacific Science. 2006, roč. 60, čís. 1, s. 137–145. Dostupné online [cit. 2019-03-22]. ISSN1534-6188. doi:10.1353/psc.2005.0061. (anglicky)
OLSON, Storrs L. Birds, including extinct species, encountered by the Malaspina Expedition on Vava'u, Tonga, in 1793. Archives of Natural History. 2006-4, roč. 33, čís. 1, s. 42–52. Dostupné online [cit. 2019-03-22]. ISSN0260-9541. doi:10.3366/anh.2006.33.1.42. (anglicky)