(2007) „Paleogene equatorial penguins challenge the proposed relationship between penguin biogeography, body size evolution, and Cenozoic climate change”. Proceedings of the National Academy of Sciences104 (28), 11545–11550. o. DOI:10.1073/pnas.0611099104. PMID17601778. PMC1913862.
nih.gov
pubmed.ncbi.nlm.nih.gov
(2007) „Paleogene equatorial penguins challenge the proposed relationship between penguin biogeography, body size evolution, and Cenozoic climate change”. Proceedings of the National Academy of Sciences104 (28), 11545–11550. o. DOI:10.1073/pnas.0611099104. PMID17601778. PMC1913862.
ncbi.nlm.nih.gov
(2007) „Paleogene equatorial penguins challenge the proposed relationship between penguin biogeography, body size evolution, and Cenozoic climate change”. Proceedings of the National Academy of Sciences104 (28), 11545–11550. o. DOI:10.1073/pnas.0611099104. PMID17601778. PMC1913862.
vashonsd.org
Tom Devries Class Web Page. Vashon Island School District. [2010. december 1-i dátummal az eredetiből archiválva]. (Hozzáférés: 2008. január 27.)
web.archive.org
Tom Devries Class Web Page. Vashon Island School District. [2010. december 1-i dátummal az eredetiből archiválva]. (Hozzáférés: 2008. január 27.)