Reddit reviews Bare Bones: Conversations on Terror With Stephen King

There were a few books of collected interviews with King published in the '80s - Bare Bones is possibly the best of these, though the same editors' Kingdom of Fear and Feast of Fear are as good. Most of the pre-2000 interviews were with print magazines and don't exist online, so these collected books are maybe your only bet for older interviews.

Probably Bare Bones

http://www.amazon.com/Bare-Bones-Conversations-Terror-Stephen/dp/0446390577