Steadman D. (2006) "A New Species of Extinct Parrot (Psittacidae: Eclectus) from Tonga and Vanuatu, South Pacific." Pacific Science60(1): 137–145 abstractArchived 2023-02-02 at the Wayback Machine
Olson, S. L: Birds, including extinct species, encountered by the Malaspina Expedition on Vava’u, Tonga and Brazil , in 1793. PDF Fulltext
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Steadman D. (2006) "A New Species of Extinct Parrot (Psittacidae: Eclectus) from Tonga and Vanuatu, South Pacific." Pacific Science60(1): 137–145 abstractArchived 2023-02-02 at the Wayback Machine