Julia A. Clarke, Daniel T. Ksepka, Marcelo Stucchi, Mario Urbina, Norberto Giannini, Sara Bertelli, Yanina Narváez, Clint A. Boyd. Paleogene equatorial penguins challenge the proposed relationship between biogeography, diversity, and Cenozoic climate change. „Proceedings of the National Academy of Sciences”. 104 (28), s. 11545–11550, 2007. DOI: 10.1073/pnas.0611099104. PMID: 17601778. (ang.).
Daniel T. Ksepka, Julia A. Clarke, Thomas J. DeVries, Mario Urbina. Osteology of Icadyptes salasi, a giant penguin from the Eocene of Peru. „Journal of Anatomy”. 213 (2), s. 131–147, 2008. DOI: 10.1111/j.1469-7580.2008.00927.x. (ang.).
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Julia A. Clarke, Daniel T. Ksepka, Marcelo Stucchi, Mario Urbina, Norberto Giannini, Sara Bertelli, Yanina Narváez, Clint A. Boyd. Paleogene equatorial penguins challenge the proposed relationship between biogeography, diversity, and Cenozoic climate change. „Proceedings of the National Academy of Sciences”. 104 (28), s. 11545–11550, 2007. DOI: 10.1073/pnas.0611099104. PMID: 17601778. (ang.).
