Pearce, D. W. (1976). Environmental economics. Longman.
Lua i Stíl Chicago (17ú heag.)Pearce, David William. Environmental Economics. London: Longman, 1976.
Lua MLA (9ú heag.)Pearce, David William. Environmental Economics. Longman, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.