If the quoted words end with a full stop, then the full stop goes inside the quotation marks. If the quoted words do not end with a full stop, then the full stop goes outside the quotation marks:
- He said: "I love you."
She has read "War and Peace".
- He said: "I love you."
She has read "War and Peace."
- He said: "Do you love me?"
Have you read "War and Peace"?
Can you imagine? He has never read "War and Peace"!