Text catalogue exhibition Van Cobra tot New Babylon, Haarlem, Galerie-T, 1968
Documentation
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Text catalogue of the exhibition Nya Babylon
Text catalogue of the exhibition Nya Babylon, Lund, Lunds Kunsthall, 1968

Over normen in de cultuur
Lecture at Flemisch culture house, De Brakke Grond in Amsterdam on February 15th, 1967 on the invitation of Civitas Acedemica Amstelodamensis.

New Babylon. En verden for Homo Ludens et New Babylon - Et forslag
New Babylon. En verden for Homo Ludens et New Babylon - Et forslag (New Babylon. A World for Homo Ludens. A suggestion) in cat. of the exhibition Constant. New Babylon, Oslo, Kunstnernes Hus, 1967.

Omtrent New Babylon. Een briefwisseling met Luc Wenseleers
Omtrent New Babylon. Een briefwisseling met Luc Wenseleers (About New babylon. A correspondence with Luc Wenseleers) in Ruimten. Letterkundig interuniversitair tijdschrift, vol 6, nº 21/22, 1967, p. 75-88.

Text catalogue exhibition Constant. Von Cobra bis New Babylon
Text catalogue exhibition Constant. Von Cobra bis New Babylon, München, Galerie Heseler, 1967.

Het lied van de arbeid
Introduction for the Sociological Interacademiale at the university of Groningen on April 20th, 1966.

New Babylon - Stad des Homo Ludens
Lecture by Constant at the opening of the exhibition Constant. New Babylon at the Volkshochschule in Cologne in 1966.