By Stephen G. Michaud and Hugh Aynesworth. Possibly the book Joe Berlinger's docuseries derives from, it's "Based on over 150 hours of exclusive tape-recorded interviews with Bundy himself."
Not in perfect shape, this paperback -- the spine has a lot of edgewear, and there's page toning; one page is dog-eared -- but the spine is uncracked. A nice reading-copy pick-up for case completists.