El-Ashry, M. T., & MacKenzie, J. J. (1989). Air pollution's toll on forests and crops. Yale University Press.
Chicago Style (17th ed.) CitationEl-Ashry, Mohamed T., and James J. MacKenzie. Air Pollution's Toll on Forests and Crops. New Haven: Yale University Press, 1989.
MLA (9th ed.) CitationEl-Ashry, Mohamed T., and James J. MacKenzie. Air Pollution's Toll on Forests and Crops. Yale University Press, 1989.
Warning: These citations may not always be 100% accurate.