Diadem series
The first six books were originally published by Apple. After the cancellation of the series by Apple, they were re-printed by Llewellyn Publications between 2004 and 2005. Books seven through ten were published directly by Llewellyn. Books eleven and twelve were only published in a one-volume edition, by Dragonhome Books, in 2012.
Also published in French by AdA Éditions, under the title Les mondes de la magie du Diadème.
Book of Names (August 1997, Paperback ISBN 0-590-05947-5, Re-print ISBN 0-7387-0617-5)
Book of Signs (August 1997, Paperback ISBN 0-590-05948-3, Re-print ISBN 0-7387-0616-7)
Book of Magic (August 1997, Paperback ISBN 0-590-05949-1, Re-print ISBN 0-7387-0615-9)
Book of Thunder (Hardback ISBN 0-590-05950-5, Re-print ISBN 0-7387-0614-0)
Book of Earth (February 1998, Paperback ISBN 0-590-14965-2, Re-print ISBN 0-7387-0613-2)
Book of Nightmares (April 1998, Paperback ISBN 0-590-14966-0, Re-print ISBN 0-7387-0612-4)
Book of War (May 2005, ISBN 0-7387-0611-6)
Book of Oceans (September 2005, ISBN 0-7387-0748-1)
Book of Reality (February 2006, ISBN 0-7387-0843-7)
Book of Doom (June 2006, ISBN 0-7387-0842-9)
Book of Time & Book of Games (November 2012, ISBN 978-0615726007)