The comma and period always go inside the closing quotation mark when there is no parenthetical reference.
"Really, there is no excuse for aggressive behavior," the supervisor said. "It sets a bad example."
The comma and period always go inside a quotation within another quotation when there is no parenthetical reference.
According to the film critic, "One of the most widely acclaimed actors in history, Humphrey Bogart, is quoted as saying, 'I don't like acting.'"
The period goes outside of the quotation mark when using a parenthetical reference.
"Animals have a variety of emotions similar to human's" (Erikson 990).
It appears you are correct. I stand corrected. No more run on sentences for me. 8^)