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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)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.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)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.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.