http://www.traveltheunbeatenpath.com/2015/04/Paolo-soleri-cosanti-tour.html
http://www.designboom.com/architecture/arcosanti-experimental-desert-town-arizona-paolo-soleri-05-19-2016/
https://simpletravelourway.wordpress.com/2013/04/23/bells-are-ringing/
http://dip18.aaschool.ac.uk/
http://www.dwell.com/books/article/artists-handmade-houses#5