Bridwell, N. (2012). Clifford sees America. Scholastic.
Lua i Stíl Chicago (17ú heag.)Bridwell, Norman. Clifford Sees America. New York: Scholastic, 2012.
Lua MLA (8ú heag.)Bridwell, Norman. Clifford Sees America. Scholastic, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.