Hale, John R., author
Age of exploration
Time-Life Books, 1974
 Buku Teks
Rosenblatt, Louise M., author
Literature as exploration
Appleton-Century-Crofts, 1938
 Buku Teks
Sadoff, Ahren, author
Questioning the Universe: concepts in physics
CRC Press, Taylor & Francis Group, 2008
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Wahlin, Lars
The Collapsing universe / Lars Wahlin
Colutron Resesrch, 1985
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Clark, Adrian V., author
Cosmic mysteries of the Universe
Parker Publishing, 1968
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