Haag, J. (1973). The Spann circle and the Jewish Question. Year Book / Leo Baeck Institute.
Lua i Stíl Chicago (17ú heag.)Haag, John. "The Spann Circle and the Jewish Question." Year Book / Leo Baeck Institute 1973.
Lua MLA (8ú heag.)Haag, John. "The Spann Circle and the Jewish Question." Year Book / Leo Baeck Institute, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.