Ehrich, R. W. (1965). Chronologies in Old World archaeology. University of Chicago Press.
Lua i Stíl Chicago (17ú heag.)Ehrich, Robert W. Chronologies in Old World Archaeology. Chicago: University of Chicago Press, 1965.
Lua MLA (9ú heag.)Ehrich, Robert W. Chronologies in Old World Archaeology. University of Chicago Press, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.