Moore, Patrick
Macmillan, 1958
Buku Teks
Moore, Patrick, author
W.W. Norton & Co., 1954
Buku Referensi
Sagan, Carl, author
Time Incorporated, 1966
Buku Referensi
Lewis, C.S., author
Macmillan, 1947
Buku Teks
Seedhouse, Erik, author
[Springer, ], 2012
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