Siefer, G. (1964). The Church and industrial society: A survey of the Worker-Priest Movement and its implications for the Christian mission. Darton, Longman and Todd.
Lua i Stíl Chicago (17ú heag.)Siefer, Gregor. The Church and Industrial Society: A Survey of the Worker-Priest Movement and Its Implications for the Christian Mission. London: Darton, Longman and Todd, 1964.
Lua MLA (9ú heag.)Siefer, Gregor. The Church and Industrial Society: A Survey of the Worker-Priest Movement and Its Implications for the Christian Mission. Darton, Longman and Todd, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.