1961, excavated as part of the Hasanlu Project sponsored by the University Museum of the University of Pennsylvania, the Archaeological Service of Iran, and The Metropolitan Museum of Art; acquired by the Museum in 1962, as a result of its financial contribution to the excavations.
Young, T.C. 1962. "Taking the History of the Hasanlu Area Back Another Five Thousand Years; Sixth and Fifth Millennium Settlements in the Solduz Valley, Persia." Illustrated London News, pp. 707-709, fig. 2.
Voigt, Mary M. 1983. Hajji Firuz, Iran: The Neolithic Settlement. Hasanlu Excavation Reports I, University Museum Monograph 50. Philadelphia: University of Pennsylvania, pl. 19h.