Carlson, N. L. (2012). Snowden. Carolrhoda Books.
Lua i Stíl Chicago (17ú heag.)Carlson, Nancy L. Snowden. Minneapolis: Carolrhoda Books, 2012.
Lua MLA (8ú heag.)Carlson, Nancy L. Snowden. Carolrhoda Books, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.