My next learning project will be Power Query. I am well-versed in importing data using Power Pivot but it’s time for me to learn about bringing data into Excel with Power Query and the M language.
I took a look on Amazon and there’s nothing except a brief mention of the tool in a couple of Dynamics AX books. I guess the only source right now is out on the web.
Look for some Power Query links on my BI Resources page as I discover them.