Backus, W. D. (1992). Empowering parents. Bethany.
Lua i Stíl Chicago (17ú heag.)Backus, William D. Empowering Parents. Minneapolis: Bethany, 1992.
Lua MLA (9ú heag.)Backus, William D. Empowering Parents. Bethany, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.