Clark, D. J. (1963). A Catholic Answer to the Race Problem: With study-club questions. Glen Rock, N.J..
Lua i Stíl Chicago (17ú heag.)Clark, Dennis J. A Catholic Answer to the Race Problem: With Study-club Questions. Glen Rock, N.J., 1963.
Lua MLA (8ú heag.)Clark, Dennis J. A Catholic Answer to the Race Problem: With Study-club Questions. Glen Rock, N.J., 1963.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.