[Julius Carlebach Gallery, New York, until 1952]; Nelson A. Rockefeller, New York, 1952, on loan to The Museum of Primitive Art, New York, 1956–1978
The Metropolitan Museum of Art. Art of Oceania, Africa, and the Americas from the Museum of Primitive Art. New York: The Metropolitan Museum of Art, 1969, no. 280.
LaGamma, Alisa. Art and Oracle: African Art and Rituals of Divination. New York: The Metropolitan Museum of Art, 2000, pp. 24–25.
Ezra, Kate. "African Art at the Museum of Primitive Art: Collecting and Constructing a Continent." In Lecture. New York: The Metropolitan Museum of Art, April 5, 2002.
Peek, Philip M. "Couples of Doubles? Representations of Twins in the Arts of Africa." African Arts vol. 41, no. 1 (Spring 2008), pp. 14-23.