Here's a breakdown:
1. American English (APA, MLA, Chicago)
* Commas go inside the quotation marks: "This is a phrase," she said. "This is another phrase," he added.
2. British English
* Commas go outside the quotation marks: "This is a phrase", she said. "This is another phrase", he added.
3. Exceptions
* If the comma is part of the quoted material, it stays inside the quotes regardless of the style guide: She said, "This is a phrase, isn't it?"
Best Practice
* Consistency is key: Choose one style and be consistent throughout your writing.
* Check your style guide: If you are writing for a specific publication or academic field, consult their style guide for their specific rules.
Let me know if you have any other grammar questions!