From the following information, determine whose book is neither a novel nor in Paperback format.

1) The books of Ken Singleton, George Smith, and Harold masters are poems.

2) The books of John Procter, Robin Hopkins and Ken Singleton are Paperbacks.

3) The books of Robin Hopkins, George Smith and John Procter are novels.

4) The books written by Ken Singleton, Harold masters and John Procter have brown leather covers with black spine.