A swiftly tilting planet
Buku Teks
Lewis, C.S.
Out of the silent planet
Macmillan, 1947
Buku Teks
L`Engle, Madeleine
A wind in the door / Madeleine L'Engle
Dell Publishing, 1973
Buku Teks
Wollheim, Donald A.
The portables novels of science
Viking Press, 1950
Buku Teks
Asimov, Isaac
The Rest of the robots / Isaac Asimov
Grafton Books, 1990.
Buku Teks