Lua APA (7ú heag.)

World Health Organization. (2000). Air quality guidelines for europe (2nd-ed.). World Health Organization.

Lua i Stíl Chicago (17ú heag.)

World Health Organization. Air Quality Guidelines for Europe. 2nd-ed. Copenhagen: World Health Organization, 2000.

Lua MLA (8ú heag.)

World Health Organization. Air Quality Guidelines for Europe. 2nd-ed. World Health Organization, 2000.

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