Parenthetical citation help?

I'm writing an essay and I have to cite this short story from my textbook. It's "The Jilting of Granny Weatherall" by Katherine Anne Porter and the quote is from page 707. Would the parenthetical/in-text citation be (Porter) or ("Jilting" 707) or something else? MLA as all across the country does. We're using the sixth edition. Thanks so much.