Não informado. (1972). Geographical survey. Ball State University, Department of Geography and Geology.
Lua i Stíl Chicago (17ú heag.)Não informado. Geographical Survey. Muncie, Ind: Ball State University, Department of Geography and Geology, 1972.
Lua MLA (8ú heag.)Não informado. Geographical Survey. Ball State University, Department of Geography and Geology, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.