Smart, J. D., & J.M. Swanson. A Promise to keep. Westminster Press.
Lua i Stíl Chicago (17ú heag.)Smart, James D., agus J.M. Swanson. A Promise to Keep. Philadelphia: Westminster Press.
Lua MLA (9ú heag.)Smart, James D., agus J.M. Swanson. A Promise to Keep. Westminster Press.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.