Hell House, by Richard Matheson. The Best of H.P. Lovecraft, H.P. Lovecraft (I have an anthology of all his ****. So good). The Complete Tales and Poems, Edgar Allen Poe.
The Cipher, Kathe Koja. Johnny Got His Gun, Dalton Trumbo (this one most of all). Scary Stories to Tell in the Dark, Alvin Schwatz (picturebook). I Have No Mouth and I Must Scream, Harlan Ellison.