Use single quotation marks for articles, essays, stories, chapters, poems, television programmes, radio programmes, and songs. If you are handwriting or using a typewriter, you indicate italics by underlining. When you quote from a book or article, you need to make clear which words are your own and which you are quoting. A longer one can be presented as a block, i.e. separated from the text by a blank line top and bottom, and marked by wider margins. For quotations within quotations, use double inverted commas.
American practice is to use single inverted commas.
Yes,' she said. The comma comes before the inverted comma. Closing quotation marks follow the punctuation marks for the sentence of which they are part, except for a colon or semi-colon. See the previous example. If you refer several times to something for which there is an established but not well known abbreviation, give the full form the first time you mention it, with the abbreviation in brackets after it.