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Roman, B. "Biological Profiles: Porbeagle". Florida Museum of Natural History Ichthyology Department. Archived from the original on 2 February 2013. Retrieved 12 November 2009.
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Elwes, H. J. & Henry, A. (1913). The Trees of Great Britain & Ireland. Vol. VII. pp 1848–1929. Private publication. "The Trees of Great Britain and Ireland". Archived from the original on 5 October 2008. Retrieved 20 September 2009.
web.archive.org
Roman, B. "Biological Profiles: Porbeagle". Florida Museum of Natural History Ichthyology Department. Archived from the original on 2 February 2013. Retrieved 12 November 2009.
Elwes, H. J. & Henry, A. (1913). The Trees of Great Britain & Ireland. Vol. VII. pp 1848–1929. Private publication. "The Trees of Great Britain and Ireland". Archived from the original on 5 October 2008. Retrieved 20 September 2009.
