Cunningham, W. P., & Saigo, B. W. (2001). Environmental science: A global concern (6th ed.). McGraw-Hill.
Cita Chicago (17th ed.)Cunningham, William P., i Barbara Woodworth Saigo. Environmental Science: A Global Concern. 6th ed. Boston: McGraw-Hill, 2001.
Cita MLA (8th ed.)Cunningham, William P., i Barbara Woodworth Saigo. Environmental Science: A Global Concern. 6th ed. McGraw-Hill, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.