The ISBN of Winter of Fire is 0590452886.
The ISBN of The Center of Winter is 0060929685.
The ISBN of A Dark Winter is 1862913684.
The ISBN of Blackthorn Winter is 0152054790.
The ISBN of In the Winter Dark is 0869140450.
The ISBN of Fires of Winter is 0380757478.
The ISBN of Out of the Fire is 0804101043.
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 The Winter of Frankie Machine is 1400044987.
The ISBN of Fire Angels is 9780380794256.
The ISBN of Fire Study is 9780778325345.