Stephens, Jay; Killick, David; Chirikure, Shadreck (22 de marzo de 2023). «Reconstructing the geological provenance and long-distance movement of rectangular, fishtail, and croisette copper ingots in Iron Age Zambia and Zimbabwe». PLOS ONE (Public Library of Science (PLoS)) 18 (3): e0282660. ISSN1932-6203. doi:10.1371/journal.pone.0282660.
Stephens, Jay; Killick, David; Chirikure, Shadreck (22 de marzo de 2023). «Reconstructing the geological provenance and long-distance movement of rectangular, fishtail, and croisette copper ingots in Iron Age Zambia and Zimbabwe». PLOS ONE (Public Library of Science (PLoS)) 18 (3): e0282660. ISSN1932-6203. doi:10.1371/journal.pone.0282660.