Anonymous. <i><a href="https://en.wikipedia.org/wiki/Theo_van_Doesburg" class="extiw" title="w:Theo van Doesburg">Theo van Doesburg</a> (right) and <a href="https://en.wikipedia.org/wiki/Cornelis_van_Eesteren" class="extiw" title="w:Cornelis van Eesteren">C. van Eesteren</a> (left) working on their architectural models in their studio in Paris.</i> 1923. Photo. <a href="//commons.wikimedia.org/wiki/Rotterdam" title="Rotterdam">Rotterdam</a>, Netherlands Architecture Institute.
Anonymous (photographer)
Manfred Bock, Vincent van Rossem, Kees Somer. <i>Cornelis van Eesteren, architect, urbanist</i> [volume 1]. Rotterdam: NAi Publishers, Den Haag: EFL Stichting (<a href="//commons.wikimedia.org/wiki/Special:BookSources/9072469623" title="Special:BookSources/9072469623">ISBN 9072469623</a>), p. 154.