Delobeau, F. (1971). The environment of the earth. Springer-Verlag.
Lua i Stíl Chicago (17ú heag.)Delobeau, Francis. The Environment of the Earth. Berlin: Springer-Verlag, 1971.
Lua MLA (9ú heag.)Delobeau, Francis. The Environment of the Earth. Springer-Verlag, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.