Valkenberg. Renewing Islam by Service. The Catholic University of America Press.
Lua i Stíl Chicago (17ú heag.)Valkenberg. Renewing Islam by Service. The Catholic University of America Press.
Lua MLA (9ú heag.)Valkenberg. Renewing Islam by Service. The Catholic University of America Press.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.