Escape from the Planet of the Apes
Jerry Pournelle
Planet of the Apes (2)
Conquest of the Planet of the Apes
John Jakes
Planet of the Apes (1)
Battle For the Planet of the Apes
David Gerrold
Planet of the Apes (4)
Monkey Planet
Pierre Boulle
Planet of the Apes
Beneath the Planet of the Apes
Michael Avallone