Have a look in the Typophile book section. Don't know the url offhand

{ Typophile Books }
www.typophile.com/books/

Depends on what you're looking for.
The Hendel book is more about how different book designers approach books.
Marshall Lee's book was seen to be the definitive guide to basic book design. Its based on his first edition which was written in 1965 so not sure how it deals with present day production techniques. One similar to this is Adrian Wilson's book.
The Hochuli book is a great one to own as its a lovely book in itself and a good introduction to various aspects of book design: different kinds of books, parts of a book...

There's also:
Five Hundred Years of Book Design: Alan Bartram

Methods of Book Design: Hugh Williamson

Notes on Book Design: Derek Birdsall

Heres the Book Arts section of Typophile Books.

Also take a look at the Publication Design section.

I've never found a better single reference than

"The Elements of Typographic Style"

by Robert Bringhurst

I've never found a better single reference than

"The Elements of Typographic Style"

by Robert Bringhurst