Leonard, J. N. (1974). The first farmers. Time-Life International.
Lua i Stíl Chicago (17ú heag.)Leonard, Jonathan Norton. The First Farmers. Nederland: Time-Life International, 1974.
Lua MLA (9ú heag.)Leonard, Jonathan Norton. The First Farmers. Time-Life International, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.