Friesen, V. L.; Anderson, D. J.; Steeves, T. E.; Jones, H. & Schreiber, E. A. (2002): Molecular Support for Species Status of the Nazca Booby (Sula granti). Auk119(3): 820–26. [English with Spanish abstract] DOI: 10.1642/0004-8038(2002)119[0820:MSFSSO]2.0.CO;2 PDF fulltextArchyvuota kopija 2006-05-23 iš Wayback Machine projekto.
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Friesen, V. L.; Anderson, D. J.; Steeves, T. E.; Jones, H. & Schreiber, E. A. (2002): Molecular Support for Species Status of the Nazca Booby (Sula granti). Auk119(3): 820–26. [English with Spanish abstract] DOI: 10.1642/0004-8038(2002)119[0820:MSFSSO]2.0.CO;2 PDF fulltextArchyvuota kopija 2006-05-23 iš Wayback Machine projekto.