How do I punctuate parenthetical citations that include an author’s name and “introduction”?

Note: This post relates to content in the eighth edition of the MLA Handbook. For up-to-date guidance, see the ninth edition of the MLA Handbook.

Separate the items with a comma:

You Must Change Your Life is “a portrait of two artists fumbling through the desultory streets of Paris, finding their paths to mastery” (Corbett, introduction).

Work Cited

Corbett, Rachel. You Must Change Your Life: The Story of Rainer Maria Rilke and Auguste Rodin. Kindle ed., W. W. Norton, 2016.