http://www.vam.ac.uk/content/articles/t/teachers-resource-maths-and-islamic-art-and-design/
http://topislamic.com/islamic-art-for-kids-download/
http://www.metmuseum.org/-/media/Files/Learn/For%20Educators/Publications%20for%20Educators/Islamic_Art_and_Geometric_Design.pdf
https://www.smashingmagazine.com/2014/03/taking-a-closer-look-at-arabic-calligraphy