Não informado. (1981). Environmental Monitoring and Assessment. Kluwer Academic Publishers.
Lua i Stíl Chicago (17ú heag.)Não informado. Environmental Monitoring and Assessment. Dordrecht, Holanda: Kluwer Academic Publishers, 1981.
Lua MLA (8ú heag.)Não informado. Environmental Monitoring and Assessment. Kluwer Academic Publishers, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.