Bibliographies:
"Calbuco." Global Volcanism Program. Smithsonian Institutions. 23 Mar. 2009 http://www.volcano.si.edu/world/volcano.cfm?vnum=1508-02=.
"Calbuco Volcano." The Smithsonian/NASA Astrophysics Data System. 23 Mar. 2009 http://adsabs.harvard.edu/abs/1995CoMP..119..345L.
Ritchie, David, and Alexander E. Gates, PH.D. "Calbuco." Encyclopedia of Earthquakes and Volcanoes. 2001.
Seach, John. "Calico Volcano." Volcano Live. 23 Mar. 2009 http://www.volcanolive.com/calbuco.html.