"Final Exit: The Practicalities of Self-Deliverance and Assisted Suicide for the Dying" by Derek Humphry.
Dell paperback and ERGO Bookstore ebook and DVD
It started out in l991 with 18 weeks on the NY Times bestseller list, and has never stopped selling. Translated into 12 languages.
This unique DIY right-to-die book was last updated in April 2010. Also now an ebook pdf and video - "Final Exit on DVD"