'Constructivist Head No. 1' 1915: Example of a piece of work by the artist in the Staedel-Museum, Frankfurt.
Naum Gabo: Sculpture and drawings by the artist in the Tate Collection.
Naum Gabo: Art Forum article by Donald Kuspit February 2000. (Free registration required)
Naum Gabo & Noton Pevsner: The Realistic Manifesto, 1920 read by Naum Gabo. (MP3)
Wikipedia: Naum Gabo: Article covering the artists life, Constructivism, his influence in Britain and his theory of art.
Zadkine and Gabo in Rotterdam: Essay discussing sculpture commissioned by the Dutch government in 1950's. From 'Art Journal', 1994 by Joan Pachner.