Não informado. (1972). Ecological Research Series. U.S. Environmental Protection Agency.
Lua i Stíl Chicago (17ú heag.)Não informado. Ecological Research Series. Washington: U.S. Environmental Protection Agency, 1972.
Lua MLA (8ú heag.)Não informado. Ecological Research Series. U.S. Environmental Protection Agency, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.