Koenig, H. G. (1994). Aging and God: Spiritual pathways to mental health in midlife and later years. Haworth Pastoral Press.
Lua i Stíl Chicago (17ú heag.)Koenig, Harold George. Aging and God: Spiritual Pathways to Mental Health in Midlife and Later Years. New York: Haworth Pastoral Press, 1994.
Lua MLA (8ú heag.)Koenig, Harold George. Aging and God: Spiritual Pathways to Mental Health in Midlife and Later Years. Haworth Pastoral Press, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.