Dyfyniad APA

BHARGAVA GOPAL. (1992). POLLUTION AND ITS CONTROL. MITTAL PUBLICATIONS.

Dyfyniad Arddull Chicago

BHARGAVA GOPAL. POLLUTION AND ITS CONTROL. NEW DELHI: MITTAL PUBLICATIONS, 1992.

Dyfyniad MLA

BHARGAVA GOPAL. POLLUTION AND ITS CONTROL. MITTAL PUBLICATIONS, 1992.

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