Quotation marks are used to enclose a quote repeated word for word.
When using a full sentence of a direct quote, the first word is capitalized.
Enclosing a quote

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Douglas Addams, The Hitchhiker’s Guide to the Galaxy, 1979

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Ernest Hemingway, Enerst hemingway Selected Letters, 1917-1961, 1981

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Douglas Adams, The Salmon of Doubt, 2002
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Douglas Adams, The Restaurant at the End of the Universe, 1980
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Lewis Carroll, Alice’s Adventure in Wonderland, 1865
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Bill Watterson, Calvin and Hobbes, 1985-1995
Single quotation marks should be used to indicate a quote inside a quote.
For example:
Fluffy later asked Selina: “Do you remember who said ‘If everyone listened to me. The world would be perfect[7]’?”
However, some authors use them instead of the “ “ double quotation marks.
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Charles Schultz, Peanuts, 1950-200
- Douglas Addams, The Hitchhiker’s Guide to the Galaxy (New York City: Harmony Books, 1979) p. 24.
- Ernest Hemingway, Enerst hemingway Selected Letters, 1917-1961 (New York City: Scribner, 1981) p. p555.
- Douglas Adams, The Salmon of Doubt (London: Macmillan, 2002) p. n24
- Douglas Adams, The Restaurant at the End of the Universe (New York City: Harmony Books, 1980) p. 38.
- Lewis Carroll, Alice’s Adventure in Wonderland (London: Macmillan, 1865) p. 47
- Bill Watterson, Calvin and Hobbes (Syndicated newspaper comic strip, May 17, 1992)
- Charles Schultz, Peanuts (Syndicated newspaper comic strip, October 13, 1993)