A swiftly tilting planet
Buku Teks
Lewis, C.S.
Out of the silent planet
Macmillan, 1947
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L`Engle, Madeleine
A wind in the door / Madeleine L'Engle
Dell Publishing, 1973
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Asimov, Isaac
The Rest of the robots / Isaac Asimov
Grafton Books, 1990.
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L`Engle, Madeleine
A wrinkle in time / Madeleine L'Engle
Dell Publishing, 1962
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