.Smith, W. H. (1990). Air pollution and forests: Interactions between air contaminants and forest ecosystems (2nd ed.). Springer-Verlag.
Chicago-referens (17:e uppl.).Smith, William H. Air Pollution and Forests: Interactions Between Air Contaminants and Forest Ecosystems. 2nd ed. New York: Springer-Verlag, 1990.
MLA-referens (9:e uppl.).Smith, William H. Air Pollution and Forests: Interactions Between Air Contaminants and Forest Ecosystems. 2nd ed. Springer-Verlag, 1990.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.