Little, M. (1976). Ecology, Energetics and Human variability. W.M.C Brown Company.
Lua i Stíl Chicago (17ú heag.)Little, Michael. Ecology, Energetics and Human Variability. NULL: W.M.C Brown Company, 1976.
Lua MLA (9ú heag.)Little, Michael. Ecology, Energetics and Human Variability. W.M.C Brown Company, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.