Levetin, E., & McMahon, K. (2011). Plants & society (6th ed.). McGraw-Hill.

Levetin, Estelle, and Karen McMahon. Plants & Society. 6th ed. New York: McGraw-Hill, 2011.

Levetin, Estelle, and Karen McMahon. Plants & Society. 6th ed. McGraw-Hill, 2011.