Krauskopf, Konrad B., author
The physical universe
McGraw-Hill , 1960
 Buku Teks
Exploration of the universe
 Buku Teks
Koupelis, Theo, author
In quest of the universe
Jones & Bartlett learning, 2011
 Buku Teks
Krauskopf, Konrad B.
The Physical Universe
MCGraw-Hill , 2000
 Multimedia
The universe grasper
 Artikel Jurnal
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