Barker, R. Don Bosco. Catholic Truth Society.
Lua i Stíl Chicago (17ú heag.)Barker, Raymond. Don Bosco. London: Catholic Truth Society.
Lua MLA (8ú heag.)Barker, Raymond. Don Bosco. Catholic Truth Society.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.