macOS Sierra: The Missing Manual: The book that should have been in the box: Pogue, David: 9781491977231: Amazon.com: Books
macOS Sierra For Dummies (For Dummies (Computer/Tech)): 9781119280651: Computer Science Books @ Amazon.com
macOS Sierra review: the Mac is now a mature platform | TechCrunch
macOS Support Essentials 10.12 - Apple Pro Training Series: Supporting and Troubleshooting macOS Sierra: 9780134713854: Computer Science Books @ Amazon .com
macOS High Sierra: Everything We Know | MacRumors
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