Speth, J. G. (2012). Global environmental challenges: Transitions to a sustainable world. Orient Blackswan.
استشهاد بنمط شيكاغوSpeth, James Gustave. Global Environmental Challenges: Transitions to a Sustainable World. New Delhi: Orient Blackswan, 2012.
MLA استشهادSpeth, James Gustave. Global Environmental Challenges: Transitions to a Sustainable World. Orient Blackswan, 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.