William, o. A., & Teske, R. J. (2011). Selected spiritual writings: Why God became man; On grace; On faith. Pontifical Institute of Mediaeval Studies.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)William, of Auvergne, و Roland J. Teske. Selected Spiritual Writings: Why God Became Man; On Grace; On Faith. Toronto, Ont.: Pontifical Institute of Mediaeval Studies, 2011.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)William, of Auvergne, و Roland J. Teske. Selected Spiritual Writings: Why God Became Man; On Grace; On Faith. Pontifical Institute of Mediaeval Studies, 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.