Koenig, H. G. (1994). Aging and God: Spiritual pathways to mental health in midlife and later years. Haworth Pastoral Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Koenig, Harold George. Aging and God: Spiritual Pathways to Mental Health in Midlife and Later Years. New York: Haworth Pastoral Press, 1994.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Koenig, Harold George. Aging and God: Spiritual Pathways to Mental Health in Midlife and Later Years. Haworth Pastoral Press, 1994.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.