Before you hand in your text, it may not be a bad idea to run through this list.

• Quote only the part of a sentence that you need. Use no more of the writer's language than you need to make or reinforce your own point.
• Incorporate the quotation into the flow of your own sentence. The quotation must fit, both syntactically and stylistically, into your surrounding language.
• Avoid freestanding quotations. A quoted sentence should never stand by itself. Use a signal phrase -at the beginning, the middle or end of the sentence- to attribute the source of the quotation.
• Use ellipsis marks. Indicate deleted language in the middle of a quoted sentence with ellipsis marks. Deleted language at the beginning or end of a sentence does not generally require ellipsis marks.
• Use brackets to add or substitute words. Use brackets to add or substitute words in a quoted sentence when the meaning of the quotation would otherwise be unclear -for example, when the antecedent of a quoted pronoun is ambiguous.
• Use source citations. Make sure that every quotation is given a reference.
• The preposition that goes with the word 'quotation' is not by but from.
• Use single quotation marks when quoting and double marks for a quotation within a quotation.
• If you are writing in British English but quoting from an American source, or vice versa, you must quote in the style of your source. Under no circumstances should you adjust any features of spelling or usage to the conventions that you yourself are applying.