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