Schmandt-Besserat, D., & Hallo, W. W. (1992). Before writing: From counting to cuneiform (First edition.). University of Texas Press.
Lua i Stíl Chicago (17ú heag.)Schmandt-Besserat, Denise, agus William W. Hallo. Before Writing: From Counting to Cuneiform. First edition. Austin: University of Texas Press, 1992.
Lua MLA (9ú heag.)Schmandt-Besserat, Denise, agus William W. Hallo. Before Writing: From Counting to Cuneiform. First edition. University of Texas Press, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.