Best for studing?

Williev

https://www.amazon.com/Certified-Information-Security-Professional-Official/dp/1119042712/ref=sr_1_1?ie=UTF8&qid=1489357588&sr=8-1&keywords=cissp

Or

https://www.amazon.com/Certified-Information-Security-Professional-Official/dp/1119314011/ref=sr_1_2?ie=UTF8&qid=1489357588&sr=8-2&keywords=cissp

d3s3rtf0x

Getting the complete pack would be beneficial as the practice test complements the book.

SteveLavoie

I would get the second one, both book are fine. Have you considered a Safaribooksonline subscription .. it is the best investment I had done for my career.