Tohutoro APA (7th ed.)

Purves,. (1977). Trace Element contamination of the environ. Elsevier.

Tohutoru Kātū Chicago (17th ed.)

Purves. Trace Element Contamination of the Environ. Amsterdam: Elsevier, 1977.

Tohutoro MLA (9th ed.)

Purves. Trace Element Contamination of the Environ. Elsevier, 1977.

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