Speth, J. G. (2008). Global Environmental Challenges: Transitions to a Sustainable World. Orient BlackSwan.
Chicago Style (17. basım) AtıfSpeth, James Gustave. Global Environmental Challenges: Transitions to a Sustainable World. New Delhi: Orient BlackSwan, 2008.
MLA (9th ed.) AtıfSpeth, James Gustave. Global Environmental Challenges: Transitions to a Sustainable World. Orient BlackSwan, 2008.
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