Here is link: https://www.mrexcel.com/products/the-transformative-magic-of-power-query-m-code-in-excel-and-power-bi/ or Amazon: https://www.amazon.com/Transformative-Magic-Power-Query-Excel/dp/1615470832/ref=sr_1_1
Mike “excelisfun” Girvin’s 4th book: The Transformative Magic of Power Query M Code in Power BI & Excel.

Book about Power Query M Code to help data analysts transform and shape data into useful, actionable information for decision makers.