http://faculty-staff.ou.edu/L/A-Robert.R.Lauer-1/span4313cap13.html em 09/04/2011

http://www.moma.org/collection/browse_results.php?object_id=81043 em 09/04/2011

http://www.russianavantgard.com/Artists/tatlin/tatlin_complex_corner_relief.html em 09/04/2011

http://argusvlinder.web-log.nl/de_avonturen_van_de_argus/2009/week25/index.html