There are several books in print that the Security+ candidate can use as a study aid for the Security+ exam.
CompTIA Security+ Study Guide: Exam SY0-101 by Mike Pastore and Emmett Dulaney
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The Ultimate Security+ Certification Exam Cram 2 Study Kit (Exam SYO-101) (Exam Cram 2) by Que Certification
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Security+ Certification All-in-One Exam Guide by Gregory White
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Security+ Guide to Networking Security Fundamentals, Second Edition by Mark Ciampa
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Security+ Study Guide by Ido Dubrawsky, Jeremy Faircloth, Michael Gregg, and Eli Faskha
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Security+ Certification for Dummies by Lawrence H. Miller and Peter H. Gregory
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Security Administrator Street Smarts: A Real World Guide to CompTIA Security+ Skills by Michael Gregg and David Miller
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Peter H. Gregory 