1. Some professionals in fields such as academia and book publishing are wedded to particular style guides whose principles vary somewhat from those found here. They're entitled to their preferences.
1. Principle 13 explains this issue in detail.
2. You often have alternative ways to punctuate. The different sorts of emphasis supplied by various marks—and why the marks influence the reader as they do—are covered in detail in Principle 8.
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Publication information: Book title: Punctuation at Work: Simple Principles for Achieving Clarity and Good Style. Contributors: Richard Lauchman - Author. Publisher: American Management Association. Place of publication: New York. Publication year: 2010. Page number: 189.
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