Não informado. (1974). Agriculture and Environment. Elsevier Scientific.
Lua i Stíl Chicago (17ú heag.)Não informado. Agriculture and Environment. Amsterdam: Elsevier Scientific, 1974.
Lua MLA (8ú heag.)Não informado. Agriculture and Environment. Elsevier Scientific, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.