Sanderson, I. T. (1971). The USA. Country Beautiful Corp..
Lua i Stíl Chicago (17ú heag.)Sanderson, Ivan T. The USA. Waukesha, Wis.: Country Beautiful Corp., 1971.
Lua MLA (8ú heag.)Sanderson, Ivan T. The USA. Country Beautiful Corp., 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.