Hügel, F., & Greene, G. M. (1928). Letters from Baron Friedrich von Hügel to a niece. J.M. Dent & Sons.
Lua i Stíl Chicago (17ú heag.)Hügel, Friedrich, agus Gwendolen Maud Greene. Letters from Baron Friedrich Von Hügel to a Niece. London ; Toronto: J.M. Dent & Sons, 1928.
Lua MLA (8ú heag.)Hügel, Friedrich, agus Gwendolen Maud Greene. Letters from Baron Friedrich Von Hügel to a Niece. J.M. Dent & Sons, 1928.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.