The Autobiography of Benjamin Franklin
https://www.gutenberg.org/files/20203/20203-h/20203-h.htm
The Project Gutenberg e-text of the book.
Finding Franklin: A Resource Guide
https://www.loc.gov/rr/program/bib/franklin/autobiography.html
A Library of Congress Web Guide to the work.
Benjamin Franklin: In His Own Words
http://www.loc.gov/exhibits/franklin/
An excellent Library of Congress online exhibition about Franklin.