Domus (Milan), no. 341, April 1958, n.p. for similar examples
Marianne Aav, Rosa Barovier Mentasti and Gordon Bowyer, et al., Tapio Wirkkala - eye, hand and thought, exh. cat., Museum of Art and Design, Helsinki, 2000, pp. 229, fig. 406, 380 for the Rhythmic Plywood and a similar example
Judith Gura, Scandinavian Furniture: A Sourcebook of Classic Designs for the 21st Century,London, 2007, p. 39 for a similar example