Deities & Demigods 22 -- A bunch of dressed up stat blocks. If it has a stat block, it can be killed.
Fiend Folio 24
Greyhawk Adventures 18
Manual of the Planes 24
Monster Manual II 19 -- A bunch of dressed up stat blocks. If it has a stat block, it can be killed.
Oriental Adventures 26
Unearthed Arcana 20