Hillyer, P. (1990). Charles de Foucauld. Liturgical Press.
Lua i Stíl Chicago (17ú heag.)Hillyer, Philip. Charles De Foucauld. Collegeville, Minn.: Liturgical Press, 1990.
Lua MLA (8ú heag.)Hillyer, Philip. Charles De Foucauld. Liturgical Press, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.