These are texts I think every bagpiper should own, read, and refer to regularly…
There are many of us who refer to this as “The Bible” when it comes to playing technique.
The Complete Pipers Handbook by P/M Brett Tidswell
The Piper’s Primer by Russ Spaulding
The Book of the Bagpipe by Hugh Cheape, ISBN-10: 0809296802
The Highland Bagpipe and Its Music by Roderick D. Cannon, ISBN-10: 0859765490