Houghton, W. E. (1970). The art of Newman's Apologia. Archon Books.
Lua i Stíl Chicago (17ú heag.)Houghton, Walter Edwards. The Art of Newman's Apologia. [Hamden, Conn.]: Archon Books, 1970.
Lua MLA (8ú heag.)Houghton, Walter Edwards. The Art of Newman's Apologia. Archon Books, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.