Tohutoro APA (7th ed.)
Sivakumar, M. (1993). Global environment series. New Delhi.
Tohutoru Kātū Chicago (17th ed.)
Sivakumar, M. Global Environment Series. TVE Prince: New Delhi, 1993.
Tohutoro MLA (9th ed.)
Sivakumar, M. Global Environment Series. New Delhi, 1993.
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