There is more information available on this subject at Ballantine Books on the English Wikipedia. |
Ballantine Books is a publisher that produces Halo books. Del Rey Books, which is a branch of Ballantine Books, published the first three Halo novels which included Halo: The Fall of Reach, Halo: The Flood and Halo: First Strike. However, it would seem that they will not return to publish any more Halo novels in the future.