Du Bois, W. E. B. The Conservation of Races: W. E. B. Du Bois. African philosophy : an anthology.(1998).
Lua i Stíl Chicago (17ú heag.)Du Bois, W. E. B. "The Conservation of Races: W. E. B. Du Bois." African Philosophy : An Anthology.(1998) .
Lua MLA (8ú heag.)Du Bois, W. E. B. "The Conservation of Races: W. E. B. Du Bois." African Philosophy : An Anthology.(1998), .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.