Quick reference overviews of Bunyan's life and work: Wikipedia
Books and Ebooks on Bunyan available through Luther Sem (or see select recommendations below)
Pilgrim's Progress: Puritan John Bunyan / Full Classic Christian Audiobook (via YouTube) (6.5 hrs)
The International John Bunyan Society: A society dedicated to the study of the life and times of John Bunyan (1628-1688)
Puritan Studies Index (Puritan Reformed Seminary): Browse 330 articles on "John Bunyan"
John Bunyan and Pilgrim's Progress--Christian History magazine, issue 11
. ATLA Religion Database: See above PDF for select articles from Atla database.
Academic Search Premier : An index to academic journal literature
Over 180 full text articles, ebooks and dissertations on Bunyan in Open Access Theological Library, including this (downloadable) PhD thesis: Turning inside out : reading and writing godly identity in seventeenth-century narratives of spiritual experience. (2018, UMass)