Books that have a full moon on the cover or where a full moon figures prominently in the story.
I'll add books to this list if you leave the titles/ISBN's in the comments.
22.
by Victoria Holt
Note: Also works for the Gothic square.
23.
by
Note: Also works for the Gothic square.
24.
by James D. Doss
Note: Also works for:
Mystery square
Ghosts square
Paranormal square
Also James D. Doss: "The Night Visitor" (ISBN 10: 0380803933; ISBN 13: 9780380803934) -- mystery involving ghosts and shamanism, so arguably also one for "Genre: Mystery" and possibly "Ghost Stories / Haunted Houses"
Come to think of it, "White Shell Woman" is from the same series as "Night Visitor", so it would work for the same additional squares as well.
The Moon is a Harsh Mistress, by Robert Heinlein. A science fiction classic, and winner of the Hugo for 1967. (Check cover, but a lot of editions do have the full moon on the cover.)