एपीए उद्धरण

Speth, J. G. (2004). Global environmental challenges, transitions to a sustainable world.

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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