Não informado. (1909). National Petroleum News. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Não informado. National Petroleum News. Cleveland, Ohio: McGraw-Hill, 1909.
Lua MLA (8ú heag.)Não informado. National Petroleum News. McGraw-Hill, 1909.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.