C. Giedion-Welcker, Jean Arp, London, 1957, p. 111, no. 101 (white marble version illustrated, p. 90; pink limestone version illustrated, p. 91; titled Human Lunar Spectral).
G. Marchiori, Arp, Milan, 1964, p. 116, no. 96 (another cast illustrated).
I. Jianou, Jean Arp, Paris, 1973, p. 72, no. 101 (titled Humaine Lunaire Spectrale).
S. Poley, Hans Arp: Die Formensprache im plastischen Werk, Stuttgart, 1978, p. 61, nos. 87-89 (small cast stone and marble versions illustrated).
F.M. Naumann, The Mary and William Sisler Collection, New York, 1984, pp. 38-41, no. 10 (illustrated in color, p. 39; titled Human Lunar Spectral; with incorrect casting date).
S. Fauchereau, Arp, New York, 1988, p. 127, no. 92 (small bronze version illustrated, p. 76).
A. Hartog and K. Fischer, eds., Hans Arp: Sculptures, A Critical Survey, Ostfildern, 2012, p. 281, no. 101 (another cast illustrated).