Asimov, Isaac, author
Foundation and earth
Doubleday, 1986
 Buku Teks
Boyd, Richard N., author
Stardust, supernovae and the molecules of life : might we all be aliens?
Springer, 2012
 eBooks
Kunhardt Jr, Philip B., author
The Joy of life: from growing old, a celebtration of lifes fun and wonder
Little, Brown & Co., 1989
 Buku Referensi
Moore, Patrick
The planet venus
Macmillan, 1958
 Buku Teks
Moore, Patrick, author
A guide to the planets
W.W. Norton & Co., 1954
 Buku Referensi
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