Cunningham, W. P., Cunningham, M. A., & Saigo, B. W. (2003). Environmental science: A global concern (7th ed.). Boston: McGraw-Hill.
Παραπομπή Chicago StyleCunningham, William P., Mary Ann Cunningham, and Barbara Woodworth Saigo. Environmental Science: A Global Concern. 7th ed. Boston: McGraw-Hill, 2003.
Παραπομπή MLACunningham, William P., Mary Ann Cunningham, and Barbara Woodworth Saigo. Environmental Science: A Global Concern. 7th ed. Boston: McGraw-Hill, 2003.
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