University of Missouri​:
​visualstudies.missouri.edu/node/17

ArtSlant:
http://www.artslant.com/global/artists/show/92153-christopher-daniggelis

Video Instruction/History (OHIO NEWS NETWORK):
http://www.ohiochannel.org/medialibrary/Media.aspx?fileId=129239

Pinterest:
https://www.pinterest.com/pentaform/chris-daniggelis/