APA
Barker A. W., . (2002). Mesoarmerican origin for an obsidian scraper from the precolumbian southeastern United States. Washington-US: Society for American Archaeology.
Chicago
Barker Alex W, . 2002. Mesoarmerican origin for an obsidian scraper from the precolumbian southeastern United States. Washington-US: Society for American Archaeology.
Harvard
Barker A. W., . (2002). Mesoarmerican origin for an obsidian scraper from the precolumbian southeastern United States. Washington-US: Society for American Archaeology.
MLA
Barker Alex W, . Mesoarmerican origin for an obsidian scraper from the precolumbian southeastern United States. Washington-US: Society for American Archaeology. 2002.