एपीए उद्धरण

Speth, J. G. (2012). Global environmental challenges: Transitions to a sustainable world. Orient Blackswan.

शिकागो स्टाइल उद्धरण

Speth, James Gustave. Global Environmental Challenges: Transitions to a Sustainable World. New Delhi: Orient Blackswan, 2012.

एमएलए उद्धरण

Speth, James Gustave. Global Environmental Challenges: Transitions to a Sustainable World. Orient Blackswan, 2012.