Carola Giedion-Welcker, Modern Plastic Art, Zurich, 1937, illustration of another cast p. 97 (dated 1933)
Michel Seuphor, Arp, Paris, 1957, illustration of the marble p. 27
Carola Giedion-Welcker, Hans Arp, Stuttgart, 1957, no. 8, illustration of the marble pp. 86 & 87
Ernst Scheidegger,ed., Zweiklang. Sophie Taeuber-Arp/Hans Arp, Zurich, 1960, illustration of another cast in the artist's studio p. 66
Michel Sephor, Petite encyclopedie de l’art, New York, 1964, no. 6, illustration of the marble n.p.
Herbert Read, Arp, London, 1968, no. 90, illustration of another cast p. 86 (with incorrect measurements)
Ionel Jianou, Jean Arp, Paris, 1973, no. 8, catalogued p. 66
Stefanie Poley, Hans Arp. Die Formensprache im plastischen Werk, Stuttgart, 1978, illustration of the plaster p. 77
Margherita Andreotti, The Early Sculpture of Jean Arp, London, 1989, no. 21, illustration of another cast pp. 184-85
Arie Hartog & Kai Fischer, Hans Arp. Sculptures. A Critical Survey, Ostfildern, 2012, no. 8, illustration of the marble pp. 67 & 241