You should use a second m-dash and omit the comma: This summer, I read The Communist Manifesto, several of Plato’s dialogues — including the Apology of Socrates and Crito — and excerpts from Cicero and Thomas Aquinas. Personally, I am not comfortable with this guideline, however, and in such a case, I try to recast the sentence: This summer, I read The Communist Manifesto, excerpts from Cicero and Thomas Aquinas, and s everal of Plato’s dialogues — including the Apology of Socrates and Crito.
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