[Article] Coon, Carleton S. & Plass, Margaret B. 1957. African Sculpture: A Walk Through the Gallery. The University Museum Bulletin. 21 (4)|[Catalogue] Plass, Margaret B. 1956. African TribalSculpture.|[Book] Hall, Henry U. 1922. "Great Benin Royal Altar". XIII, No.2 (June). 105-168.|[Article] Plass, Margaret B. 1959. The Art of Benin. Expedition The Magazine of the University of Pennsylvania Museum of Archaeology and Anthropology. 1 (4)|[Catalogue, Exhibition] Curnow, Kathy. 2016. Iyare! Splendor and Tension In Benin's Palace Theatre.