"great book on sustainable beekeeping with top-bar hives" There is a lot of information on the web about beekeeping with top-bar hives and sustainable beekeeping in general, but it is scattered and often conflicting. The Barefoot Beekeeper, by PJ Chandler concisely maps out precisely how to keep bees in a top-bar hive and do it with minimal or even without chemicals -- a gentler approach to beekeeping.
For context he includes a great introduction to the history of beekeeping, past and present, to include the evolution of the beehive itself. Interesting and engaging stuff.
Be sure to visit the author's website, www.biobees.com,... More > and download the free instructions on building his version of a top-bar hive. For whatever reason he did not include those instructions in the book, but they are available for free anyway from his website.
I am a beekeeper with quite a few beekeeping books. This is a really well written book that would complement the bookshelf of any beekeeper. Highly recommended.