Doughtie, P., & Perry, J. (2010). Letters to God: A novel. Zonderkidz.
Lua i Stíl Chicago (17ú heag.)Doughtie, Patrick, agus John Perry. Letters to God: A Novel. Grand Rapids, Michigan: Zonderkidz, 2010.
Lua MLA (9ú heag.)Doughtie, Patrick, agus John Perry. Letters to God: A Novel. Zonderkidz, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.