Whelan, J. P. (1971). The spirituality of Friedrich von Hügel. Newman Press.
Lua i Stíl Chicago (17ú heag.)Whelan, Joseph P. The Spirituality of Friedrich Von Hügel. New York: Newman Press, 1971.
Lua MLA (8ú heag.)Whelan, Joseph P. The Spirituality of Friedrich Von Hügel. Newman Press, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.