Smithsonian Tropical Research Institute (n.d.). "Barro Colorado Island". Terrestrial Research Facilities. STRI. Archived from the original on 2008-12-04. Retrieved 2009-10-10.
Smithsonian Tropical Research Institute (n.d.). "Barro Colorado Island". Terrestrial Research Facilities. STRI. Archived from the original on 2008-12-04. Retrieved 2009-10-10.