Urey, Harold C.
The planets : their origins and development
"London: New Haven Yale Uni. Press, 1952",
Buku Teks
Brown, Bruce
The Miracle Planet/ Bruce Brown and Lane Morgan
Merehurst , 1990
Buku Teks
Investigating the earth
Houghton Mifflin, 1967
Buku Teks
Dalrymple, G. Brent, author
The age of the earth
Stanford Univ.Press, 2001
Buku Teks
Bukti visual penemuan planer pada bintang fomalhaut
Artikel Jurnal
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