Conversation so far:
who wrote the legend of king arthur and his knights of the round table
The legendary Arthur developed as a figure of international interest largely through the popularity of Geoffrey of Monmouth's 12th-century Historia Regum Britanniae (History of the Kings of Britain).
Who wrote the book called the wonderful wizard of oz
L. Frank Baum wrote the book The Wonderful Wizard of Oz.

Question: who is the publisher of the book
Self-contained rewrite: who is the publisher of the book The Wonderful Wizard of Oz