The difference is that a retired book shows a banner at the top that says a book is no longer being worked on.
A book that is unpublished sends the message that it may be published someday, and the author is working on it.
In both cases, a book cannot be purchased.
Here is an article on how to "unpublish" a book: http://help.leanpub.com/en/articles/110680-can-i-unpublish-my-book-how
Here is an article on how to "retire" a book:
OK, that's it!
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