Macusani obsidian from southern Peru: a characterization of its elemental composition with a demonstration of its ancient useDOI: info:10.1016/j.jas.2009.10.021v. 37No. 3569–576
Craig, Nathan, Speakman, Robert Jeff, Popelka-Filcoff, Rachel S., Aldenderfer, Mark S., Blanco, Luis Flores, Vega, Margaret Brown, Glascock, Michael D., and Stanish, Charles. 2010. "Macusani obsidian from southern Peru: a characterization of its elemental composition with a demonstration of its ancient use." Journal of Archaeological Science, 37, (3) 569–576. https://doi.org/10.1016/j.jas.2009.10.021.