P R Trivedi. (1998). Encyclopaedia of environment, pollution,planning and conservation,Vol.3: Natural resources conservation. APH Publishing corporation.
Styl ChicagoP R Trivedi. Encyclopaedia of Environment, Pollution,planning and Conservation,Vol.3: Natural Resources Conservation. New Delhi: APH Publishing corporation, 1998.
Citace podle MLAP R Trivedi. Encyclopaedia of Environment, Pollution,planning and Conservation,Vol.3: Natural Resources Conservation. APH Publishing corporation, 1998.
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