The ISBN of A Dark Winter is 1862913684.
The ISBN of In the Winter Dark is 0869140450.
The ISBN-10 for "When It Was Dark" by Guy Thorne is 1973723696.
The ISBN of The Center of Winter is 0060929685.
The ISBN of Blackthorn Winter is 0152054790.
The ISBN of Winter of Fire is 0590452886.
The ISBN of Fires of Winter is 0380757478.
The ISBN of The Winter Knights is 978-0385607209.
The ISBN of The Winter Prince is 978-0689317477.
The ISBN of Winter in Madrid is 978-1405005463.
The ISBN of A Dark Victory is 1862914060.
The ISBN of Plowing the Dark is 0374234612.
The ISBN of The Dark Arena is 0345441699.