Armitage, Angus
The world of Copernicus: sun, stand thou still / Angus Armitage
Mentor Books, 1952
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Armitge, Angus
The World of copernicus (original title: Sun, stand thou still) / Angus Armitage
The New American Library, 1956
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Fischer, Fritz
World power or decline: the controversy over Germany's aims in the first world war
W.W. Norton, 1974
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Buckley, Shawn
Sun up to sun down
McGraw-Hill, 1979
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Stein, Gabriele
English world-formation over two centuries / Gabriele Stein
Tubiger Beitrage zur Linguistik, 1973
 Buku Teks SO