Cunningham, W. P., & Saigo, B. W. (2001). Environmental science: A global concern (6th ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Cunningham, William P., agus Barbara Woodworth Saigo. Environmental Science: A Global Concern. 6th ed. Boston: McGraw-Hill, 2001.
Lua MLA (8ú heag.)Cunningham, William P., agus Barbara Woodworth Saigo. Environmental Science: A Global Concern. 6th ed. McGraw-Hill, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.