"Antisana Ecological Reserve". Summer Experience in Ecuador. Washington College and the University of San Francisco at Quito. 1998. Archived from the original on 2008-05-09. Retrieved 2008-04-02.
web.archive.org
"Antisana Ecological Reserve". Summer Experience in Ecuador. Washington College and the University of San Francisco at Quito. 1998. Archived from the original on 2008-05-09. Retrieved 2008-04-02.