Não informado. (1925). Economic Geography. Clark University.
Lua i Stíl Chicago (17ú heag.)Não informado. Economic Geography. Worcester, Mass: Clark University, 1925.
Lua MLA (8ú heag.)Não informado. Economic Geography. Clark University, 1925.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.