Não informado. (1970). Nordic Hydrology. Nordic Association for Hydrology.
Lua i Stíl Chicago (17ú heag.)Não informado. Nordic Hydrology. Kobenhavn: Nordic Association for Hydrology, 1970.
Lua MLA (8ú heag.)Não informado. Nordic Hydrology. Nordic Association for Hydrology, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.