Du Bois, W. E. B., & Wortham, R. (2011). The sociological souls of Black folk: Essays. Lexington Books.
Lua i Stíl Chicago (17ú heag.)Du Bois, W. E. B., agus Robert Wortham. The Sociological Souls of Black Folk: Essays. Lanham, Maryland: Lexington Books, 2011.
Lua MLA (9ú heag.)Du Bois, W. E. B., agus Robert Wortham. The Sociological Souls of Black Folk: Essays. Lexington Books, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.