APA (7 वां संस्करण) प्रशस्ति पत्र

Njoku, H. I. (2019). Assessment of heavy metal in domestic waters in four local government area of Osun State,Nigeria. Obafemi Awolowo University.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Njoku, Happiness Ihechi. Assessment of Heavy Metal in Domestic Waters in Four Local Government Area of Osun State,Nigeria. Obafemi Awolowo University, 2019.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Njoku, Happiness Ihechi. Assessment of Heavy Metal in Domestic Waters in Four Local Government Area of Osun State,Nigeria. Obafemi Awolowo University, 2019.

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