Dyfyniad APA

U.S. Environmental Protection Agency EPA. Terms of Environment, Glossary, Abbreviations and Acronyms.

Dyfyniad Arddull Chicago

U.S. Environmental Protection Agency EPA. Terms of Environment, Glossary, Abbreviations and Acronyms.

Dyfyniad MLA

U.S. Environmental Protection Agency EPA. Terms of Environment, Glossary, Abbreviations and Acronyms.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.