Only two of the four Christopher Reeve Superman movies were adapted into novelizations.

Superman III (1983) was novelized by William Kotzwinkle, who also wrote the ET novelization.

Superman III

 
Superman IV

The final sequel by Cannon in 1987 was novelized by B.B. Hiller and was part of the 50th anniversary of the character. This is the first time we’ve dug into a book from the Scholastic Point series of 80s era junior novelizations!