About the meaning of construction in Data. Directions in Art, Theory and Aesthetics: An Anthology edited by Anthony Hill, London, Faber and Faber, 1968, pp. 175-179.
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 (About New babylon. A correspondence with Luc Wenseleers) in Ruimten. Letterkundig interuniversitair tijdschrift, vol 6, nº 21/22, 1967, p. 75-88.
Nieuw Urbanisme (New Urbanism) in Provo, nº 9, May 1966, p. 2-6.
New Urbanism Buffalo, NY: Friends of Malatesta, 1970
New Urbanism in Delta, vol. 10, nº 3, 1967, p. 54-61.
Ny urbanisme in Arkitekt og billedkunst, n.d., 1969, p. 70-71
Lecture for the members of the BNA, the union of Dutch architects, at the finish of the new Schiphol (1966).Published in English: On travelling in Studio International, vol. 185, nº 955, May 1972, p. 228-229
Text catalogue exhibition Neue Tendenzen der Architektur, Bern, Kunsthalle, 1966.Or more probable: Licht und Bewegung / Kinetische Kunst/ Neue Tendenzen der Architektur, 30 July – 5 September 1965, Bern Kunsthalle
In De dialektiek van het experiment (The Dialectic of the Experiment) Constant looks back at the preceding period in his career and the radical transformation that took place in his artistic development during the 1950s. He declares that while he can visualize ‘unitary urbanism’, the present state of society is fundamentally different from the societal situation essential to the realization of such a revolutionary programme. Consequently, unitary urbanism remains limited to isolated experiments and a programme.
New Babylon: een schets voor een cultuur is an Dutch adaptation of an original German manuscript in collaboration with Caspari translated and adjusted by Constant. A summary of the Dutch text was published in 1974 in the exhibition catalogue at Gemeentemuseum Den Haag. Neither the original Dutch text of 125 pages nor the German manuscript of 165 pages was ever published as a whole until 2021.