APA استشهاد

Speth, J. G. (2004). Global Environmental challenges, Transitions to a sustainable world.

استشهاد بنمط شيكاغو

Speth, James Gustave. Global Environmental Challenges, Transitions to a Sustainable World. Hyderabad, Orient Longman, 2004.

MLA استشهاد

Speth, James Gustave. Global Environmental Challenges, Transitions to a Sustainable World. 2004.