Tohutoro APA (7th ed.)
Poonia, M., & Sharma, S. (2017). Environmental studies. Khanna Book Publishing Co.
Tohutoru Kātū Chicago (17th ed.)
Poonia, M.P, me S.C Sharma. Environmental Studies. New Delhi: Khanna Book Publishing Co, 2017.
Tohutoro MLA (9th ed.)
Poonia, M.P, me S.C Sharma. Environmental Studies. Khanna Book Publishing Co, 2017.
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