To properly cite the source of a quotation or paraphrase, you follow the quotation or paraphrase with a citation in parentheses, as in these examples: Quotation and citation: According to the United States Geological Survey, “one-third of the planet’s amphibian species are threatened with extinction.” (USGS 2016) Paraphrase and citation: Amphibian populations, such as species of frogs and toads, are declining and many of the world’s amphibian species at risk of becoming extinct. (USGS 2016)
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Quotation: "One-third of the planet’s amphibian species are threatened with extinction" (USGS 2016).
Paraphrase: Amphibian populations, including frogs and toads, are declining globally, with many species at risk of extinction (USGS 2016).