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Ahlquist, Jon E., 1999: Charles G. Sibley: A commentary on 30 years of collaboration.
The Auk, vol. 116, no. 3 (July 1999). A PDF or DjVu version of this article can be downloaded from the issue's table of contents pageArchiválva2012. február 5-i dátummal a Wayback Machine-ben.
web.archive.org
Ahlquist, Jon E., 1999: Charles G. Sibley: A commentary on 30 years of collaboration.
The Auk, vol. 116, no. 3 (July 1999). A PDF or DjVu version of this article can be downloaded from the issue's table of contents pageArchiválva2012. február 5-i dátummal a Wayback Machine-ben.