Tillich, P. (1973). The boundaries of our being: A collection of his sermons, The eternal now and The new being, with his autobiographical sketch, On the boundary. Collins.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Tillich, Paul. The Boundaries of Our Being: A Collection of His Sermons, The Eternal Now and The New Being, with His Autobiographical Sketch, On the Boundary. [London]: Collins, 1973.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Tillich, Paul. The Boundaries of Our Being: A Collection of His Sermons, The Eternal Now and The New Being, with His Autobiographical Sketch, On the Boundary. Collins, 1973.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.