Foucauld, C. d. (1979). Inner search: Letters (1889-1916). Orbis Books.
Lua i Stíl Chicago (17ú heag.)Foucauld, Charles de. Inner Search: Letters (1889-1916). Maryknoll, N.Y.: Orbis Books, 1979.
Lua MLA (8ú heag.)Foucauld, Charles de. Inner Search: Letters (1889-1916). Orbis Books, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.