Yes! Actually, this rule works for all punctuation, not just periods -- commas, exclamation or question marks, any phrase-ending punctuation you encounter. Include in quotes any punctuation that accompanies the quoted material, like dashes or ellipses...
John wanted the "soup du jour."
"I don't understand," she exclaimed, "who's invited?"
Kitty yelled, "Hello!"
"Et tu, Brute?" (Shakespeare).