P.R.Trivedi. (1999). Encyclopaedia of world environment: 5vols. APH.
Chicago Edition CitationP.R.Trivedi. Encyclopaedia of World Environment: 5vols. New Delhi: APH, 1999.
Deismireacht MLAP.R.Trivedi. Encyclopaedia of World Environment: 5vols. APH, 1999.
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