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hawaii.edu
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Conant, Sheila (1985). "Recent Observations on the Plants of Nihoa Island, Northwestern Hawaiian Islands". Pacific Science. University of Hawaii Press. 39 (2): 135–149. hdl:10125/92 1. Archived.
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"Nihoa Island". www.janeresture.com. Diarsipkan dari versi asli tanggal 2008-05-09. Diakses tanggal 2017-11-06.