Extensive background information about the Situationist International and Constant in English.
Documentation
Pages
J. Seegers
Jaski Gallery
Information on the Cobra group
Kunstbus
Short biography of Constant in Dutch.
Kunstgeografie.nl
About Amsterdam in the sixties. References Constant, his New Babylon project, artists he worked with and his affiliation with the Provos.
Kunststroming Cobra
Educational website for children about the Cobra group
La Revue des Ressources
PDF's of text of the Internationale Situationiste.
Mark Dek
Short biography of Constant in Dutch.
Mieke Rozing
A video presentation for children about Constant in Dutch.
Notbored.org
Extensive background information on Constant in English.
Sikkens Foundation
Jury rapport of the Sikkens award in 1960, won by Aldo van Eyck and Constant for their project Voor een spatiaal colorisme in Dutch.