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WikiPedia: Họ_Vẹt_New_Zealand http://www.birds.cornell.edu/clementschecklist/dow... https://www.ncbi.nlm.nih.gov/pmc/articles/PMC27273... http://www3.interscience.wiley.com/journal/1185462... http://digitallibrary.amnh.org/handle/2246/830 https://books.google.com/books?id=nQgOAAAAQAAJ&dq=... https://species.wikimedia.org/wiki/Strigopidae?use... https://commons.wikimedia.org/wiki/Category:Strigo... https://archive.org/details/systematicstaxon00chri https://archive.org/details/systematicstaxon00chri... https://archive.org/details/manualparrotbeha00lues