[[VON HUGEL 1913]]\\
**Eternal life : a study of its implications and applications / by Friedrich von Hugel.** - 2. ed. rev. - Edinburgh : Clark, 1913. - XLIX, 443, [16] p. ; 22 cm.

[[VON HUGEL-KEMP SMITH 1981]]\\
**The letters of baron Friedrich von Hügel and professor Norman Kemp Smith / edited by Lawrence F. Barmann.** - New York : Fordham University Press, 1981. - 353 p., [1] carta di tav. : ritratti ; 24 cm.