Allison, L. (1991). Ecology and utility: The philosophical dilemmas of planetary management. Fairleigh Dickinson University Press.
Lua i Stíl Chicago (17ú heag.)Allison, Lincoln. Ecology and Utility: The Philosophical Dilemmas of Planetary Management. Rutherford [N.J.]: Fairleigh Dickinson University Press, 1991.
Lua MLA (9ú heag.)Allison, Lincoln. Ecology and Utility: The Philosophical Dilemmas of Planetary Management. Fairleigh Dickinson University Press, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.