Textbook on absolute continuity

Question

Can someone please recommend a textbook that gives a substantial treatment of absolute continuity and is accessible (written for students; sticks to the real numbers instead of turning to more abstract generalizations)?

Answer 1

The Wikipedia page on absolute continuity frequently uses Royden, H.L. (1988), Real Analysis (third ed.) as a reference. I think newer editions of this book are co-authored by Fitzpatrick, as Google searching the reference brought me to this pdf. See page 119 in the book numbering, page 130 in the pdf. I hope this helps.

Answer 2

A way more substantial (but still accessible) treatment than the one in Royden's book can be found in Leoni's A First Course in Sobolev Spaces.