When you look at available PowerShell books, almost every link at the Internet points you to the infamous:
Jones, Don, and Jeffrey T. Hicks. Learn Windows PowerShell 3 in a Month of Lunches. Manning, 2013.
This book is indeed very good and professionally written. However, it doesn’t explain some basics which are very important for understanding PS features. It feels like you are being dragged into a dark and scary forest of this bloody PowerShell. On the serious note, I could say that this book was written by PS gurus who can barely walk in the shoes of ordinary Linux users or SW engineers.
Instead of it, I would recommend checking out this one:
Santos, Donabel. “PowerShell for SQL Server essentials.” (2015).
It has it all, plus puts it into SQL server context. Delicious!
I very much like the author’s style and the way of approaching main concepts. He just explains it to you as to a colleague without trying to impress you with his deep knowledge of the subject.
Great job, Mr. Santos!
Cloud Application Security 
This is a really nice one, thank you!