Não informado. (1999). Miscellaneous Series. North Dakota Geological Survey.
Lua i Stíl Chicago (17ú heag.)Não informado. Miscellaneous Series. Grand Forks, ND: North Dakota Geological Survey, 1999.
Lua MLA (8ú heag.)Não informado. Miscellaneous Series. North Dakota Geological Survey, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.