Kumra, V. K., Nag, P., & Singh, J. (1997). Geography and environment. Concept Pub.
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Citação norma Chicago
Kumra, V. K., Prithvish Nag, and Jagdish Singh. Geography and Environment. New Delhi: Concept Pub, 1997.
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Citação norma MLA
Kumra, V. K., et al. Geography and Environment. Concept Pub, 1997.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.