Wright, R. T., & Nebel, B. J. (2002). Environmental science: Toward a sustainable future (Eighth edition.). Pearson Education.
Lua i Stíl Chicago (17ú heag.)Wright, Richard T., agus Bernard J. Nebel. Environmental Science: Toward a Sustainable Future. Eighth edition. Upper Saddle River, New Jersey: Pearson Education, 2002.
Lua MLA (9ú heag.)Wright, Richard T., agus Bernard J. Nebel. Environmental Science: Toward a Sustainable Future. Eighth edition. Pearson Education, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.