Brown, J. A., & Brues, A. M. (1996). The Spiro Ceremonial Center: The archaeology of Arkansas Valley Caddoan culture in Eastern Oklahoma. Museum of Anthropology, University of Michigan.
Lua i Stíl Chicago (17ú heag.)Brown, James Allison, agus Alice Mossie Brues. The Spiro Ceremonial Center: The Archaeology of Arkansas Valley Caddoan Culture in Eastern Oklahoma. Ann Arbor, Mich: Museum of Anthropology, University of Michigan, 1996.
Lua MLA (9ú heag.)Brown, James Allison, agus Alice Mossie Brues. The Spiro Ceremonial Center: The Archaeology of Arkansas Valley Caddoan Culture in Eastern Oklahoma. Museum of Anthropology, University of Michigan, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.