Dopp, K. E. (1904). The early cave-men. Rand, McNally & Co..
Lua i Stíl Chicago (17ú heag.)Dopp, Katharine Elizabeth. The Early Cave-men. Chicago ; New York [etc.]: Rand, McNally & Co., 1904.
Lua MLA (8ú heag.)Dopp, Katharine Elizabeth. The Early Cave-men. Rand, McNally & Co., 1904.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.