National Conference on Indian Environment & Singh, P. (1992). Indian environment: Proceedings of National Conference organised by Institute of Environmental Sciences, "Chitrakut Gramoday Vishwavidyalay Chitrakut". Ashish Publishing.
Citace podle Chicago (17th ed.)National Conference on Indian Environment a Parmod Singh. Indian Environment: Proceedings of National Conference Organised by Institute of Environmental Sciences, "Chitrakut Gramoday Vishwavidyalay Chitrakut". New Delhi: Ashish Publishing, 1992.
Citace podle MLA (9th ed.)National Conference on Indian Environment a Parmod Singh. Indian Environment: Proceedings of National Conference Organised by Institute of Environmental Sciences, "Chitrakut Gramoday Vishwavidyalay Chitrakut". Ashish Publishing, 1992.
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