http://sustain-earth.com/2015/03/integrated-education-vision-levels-and-dimensions-in-a-holistic-perspective/
http://www.centerforglobaldialogue.org/wp-content/uploads/2012/10/FLYER3.pdf
http://www.centerforglobaldialogue.org/wp-content/uploads/2012/10/FLYER3.pdf