Hughes, J. W. (2007). Environmental problem solving: A how-to guide. University of Vermont Press ; Published by University Press of New England.
Čikaški stil citiranja (17. izdanje)Hughes, Jeffrey W. Environmental Problem Solving: A How-to Guide. Burlington, VT : Hanover: University of Vermont Press ; Published by University Press of New England, 2007.
MLA način citiranja (9. izdanje)Hughes, Jeffrey W. Environmental Problem Solving: A How-to Guide. University of Vermont Press ; Published by University Press of New England, 2007.
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