Schühly, G., & Mueller, U. (1997). Secularization in Eastern and Western Europe Results from the ISSP 1991 Survey on Religion in 10 West and East European Nations.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Schühly, Günther, و Ulrich Mueller. Secularization in Eastern and Western Europe Results from the ISSP 1991 Survey on Religion in 10 West and East European Nations. Mannheim, 1997.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Schühly, Günther, و Ulrich Mueller. Secularization in Eastern and Western Europe Results from the ISSP 1991 Survey on Religion in 10 West and East European Nations. 1997.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.