The ISBN of Realm of Kings is 0-7851-4809-4.
The ISBN of The Immortal Realm is 9780060871550.
The ISBN of The Defence of the Realm is 0713998857.
The ISBN of The Realm of Possibility - novel - is 0375828451.
The ISBN of Tales from the Perilous Realm is 9780007257546.
The ISBN of The Death of Kings is 0007136919.
The ISBN of The Kings of Clonmel is 9781864719116.
The ISBN of The Road of Kings is 0553120263.
The ISBN of War of Kings is 0-7851-3339-9.
The ISBN of In the Courts of the Crimson Kings is 978-0765314895.
The ISBN of The Kings of New York is 978-1592402618.
The ISBN of In the Valley of the Kings is 978-0-393-07121-4.
The ISBN of The Way of Kings is 978-0-7653-2635-5.