Aptheker, H. (1970). The urgency of Marxist-Christian dialogue (1st Harper Colophon ed.). Harper Colophon Books.
Lua i Stíl Chicago (17ú heag.)Aptheker, Herbert. The Urgency of Marxist-Christian Dialogue. 1st Harper Colophon ed. New York: Harper Colophon Books, 1970.
Lua MLA (8ú heag.)Aptheker, Herbert. The Urgency of Marxist-Christian Dialogue. 1st Harper Colophon ed. Harper Colophon Books, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.