Dyfyniad APA

Andersen, S. O. (2002). Protecting the ozone layer. London: Earthscan Publications Ltd.

Dyfyniad Arddull Chicago

Andersen, Stephen O. Protecting the Ozone Layer. London: Earthscan Publications Ltd, 2002.

Dyfyniad MLA

Andersen, Stephen O. Protecting the Ozone Layer. London: Earthscan Publications Ltd, 2002.

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