Gil Raviv

Gil Raviv, Collect, Combine and Transform Data Using Power Query in Excel and Power BI (Pearson Education, 2019)

Ken Puls and Miguel Escobar

M is for Data Monkey (A Practical Guide to Conquer Power Query & the M Language) (Holy Marco! Books, 2015)

Ken Puls and Miguel Escobar

Magic Tricks for Data Wizards, (available with this free online training course)

Christopher Webb

Power Query for Power BI and Excel (Apress, 2014)