Use single quotation marks. Use double quotation marks only for quotes within quotes.
Use quotation marks for:
Punctuation occurs inside quotation marks if:
Example
She asked, ‘Is it raining?’
Example
‘I run fast,’ she said.
Example
She said, ‘It’s time to go home.’
Punctuation occurs outside quotation marks if it is part of the sentence outside the quoted text.
Example
She said that it was ‘time to go home’.
Format quotes 30 words or longer as block quotes without quotation marks. This can be shown in your manuscript by indenting the quote and separating it from the text above and below with a paragraph space.
Make sure all quoted material is sourced in the text and included in your list of references (see References).