Dyfyniad APA

World Health Organization. (2004). Concise International chemical Assessment Document; As Phalt (Bitumen). IOMS.

Dyfyniad Arddull Chicago

World Health Organization. Concise International Chemical Assessment Document; As Phalt (Bitumen). Ginebra: IOMS, 2004.

Dyfyniad MLA

World Health Organization. Concise International Chemical Assessment Document; As Phalt (Bitumen). IOMS, 2004.

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