Power Query (informally known as "M") Formula reference
https://msdn.microsoft.com/en-us/library/mt211003.aspx
http://download.microsoft.com/download/8/1/A/81A62C9B-04D5-4B6D-B162-D28E4D848552/Power%20Query%20Formula%20Language%20Specification%20(August%202015).pdf
Power Query M function reference
https://msdn.microsoft.com/en-us/library/mt779182.aspx
Expressions, values, and let expression
https://msdn.microsoft.com/en-us/library/mt299038.aspx
Type conversion
https://msdn.microsoft.com/en-us/library/mt186370.aspx
Power BI Desktop でのデータ型
https://powerbi.microsoft.com/ja-jp/documentation/powerbi-desktop-data-types/
Data Analysis Expressions (DAX) リファレンス
https://msdn.microsoft.com/library/gg413422.aspx
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