Zilpha Keatley Snyder

Until the Celebration is a fantasy novel by Zilpha Keatley Snyder, the third book in the Green Sky Trilogy.

And All Between is a science fiction/fantasy novel by Zilpha Keatley Snyder, the second book in the Green Sky Trilogy. The book's title comes from one of the Green-sky chants, containing the phrase "And all between becomes among, / And they are we and old is young, / And earth is sky, / And all is one."

Below the Root is a science fiction/fantasy novel by Zilpha Keatley Snyder, the first book in the Green Sky Trilogy. The 1984 videogame Below the Root is based on the book series.

The Changeling is a young adult novel by Zilpha Keatley Snyder. This book was first published in 1970. It was awarded a Christopher Award and named an outstanding book for young people by the Junior Library Guild.