Poonia, M., & Sharma, S. (2017). Environmental studies. Khanna Book Publishing Co.
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Dyfyniad Arddull Chicago
Poonia, M.P, and S.C Sharma. Environmental Studies. New Delhi: Khanna Book Publishing Co, 2017.
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Dyfyniad MLA
Poonia, M.P, and S.C Sharma. Environmental Studies. Khanna Book Publishing Co, 2017.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.