Levering, M., & O'Regan, C. (2019). The achievement of Hans Urs von Balthasar: An introduction to his trilogy. The Catholic University of America Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Levering, Matthew, و Cyril O'Regan. The Achievement of Hans Urs Von Balthasar: An Introduction to His Trilogy. Washington, D.C.: The Catholic University of America Press, 2019.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Levering, Matthew, و Cyril O'Regan. The Achievement of Hans Urs Von Balthasar: An Introduction to His Trilogy. The Catholic University of America Press, 2019.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.