In terms of designing an appropriate enclosure for a given set of drivers (i.e., first and foremost, to get the most out of a woofer) I like Ray Alden's books. No idea if any of them are still in print.
David Weems books are good.
FWIW, I don't much care for Vance Dickason's cookbooks (although I do own a copy of one, probably about 12 or more years old) -- because they are just that, cookbooks. Hard (IMO) to take the information there and extrapolate to something else. Alden, e.g., gives enough theory and equations to let one actually do some
design with only minimal formal education in the physics of acoustics.
It's also worth mentioning that some of the most
interesting loudspeaker enclosure designs generally don't get much
airplay in the massmarket speaker design books. Here's an excellent example, in my hardly-humble opinion.
http://www.quarter-wave.com/
The OP might also want to look at some of the classic designs.
Here's a simple, one-stop-shopping example that's easy to get and well worth perusal (again, IMO).
http://www.tubebooks.org/file_downloads/Jensen_spkr_plans.pdf
Here's another one,
albeit somewhat less interesting
https://www.electrovoice.com/binary/Bulletin10A.pdf
Finally, Dr. Harry F. Olson did, rather literally, write the book on loudspeaker design principles.
Serious perusal of the subject should include his work (as well as that of the pioneers at Western Electric, of course).
http://cyrille.pinton.free.fr/electroac/lectures_utiles/son/Olson.pdf (1940)
http://cyrille.pinton.free.fr/electroac/lectures_utiles/son/Olson.pdf (1957)
Here's a rather cool Olson book (not explicitly on loudspeaker design) from Pete Millett's wonderful resource
www.tubebooks.org
http://www.tubebooks.org/Books/Atwood/Olson 1943 Dynamical Analogies.pdf