Não informado. (1983). Agriculture, Ecosystems & Environment. Elsevier Science Publishers.
Lua i Stíl Chicago (17ú heag.)Não informado. Agriculture, Ecosystems & Environment. Amsterdam: Elsevier Science Publishers, 1983.
Lua MLA (8ú heag.)Não informado. Agriculture, Ecosystems & Environment. Elsevier Science Publishers, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.