PMP Study Guide by Kim Heldman 7th Edition

I have the PMP study guide (7th Edition) authored by Kim Heldman which covers the PMBOK 5 but came to know that there is a new eighth edition and another edition covering 2015 exam in the market.
Can I continue using the PMP study guide (7th Edition) for the exam in year 2016. Is this material still relevant? Please advice.
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The changes are minor so i believe you can continue to use it.