Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
http://www.myworldshots.com/Fountains/Roma-Fountain-of-Four-Rivers-by-Bernini-704.html#Roma-Fountain-of-Four-Rivers-by-Bernini-704
http://www.romaviva.com/Piazza-Navona/fountain-four-rivers.htm
hsonianmag.com/arts-culture/berninis-genius-11934809/?no-ist=
http://www.foroxerbar.com/viewtopic.php?t=4467
http://www.viajaraitalia.com/fuente-de-los-cuatro-rios/
http://www.loquehayqueverenitalia.es/la-fuente-de-los-cuatro-rios/
Google Maps
http://s46.photobucket.com/user/civilis/media/blog/navona/nilo1.jpg.html