Gupta, S. (2000). Global environment: Current status. Sarup & Sons.
Cita Chicago (17th ed.)Gupta, Sunit. Global Environment: Current Status. New Delhi: Sarup & Sons, 2000.
Cita MLA (9th ed.)Gupta, Sunit. Global Environment: Current Status. Sarup & Sons, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.