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Baris 215: {{Reflist\|colwidth=30em}} ===Sumber=== * {{cite book \|url=http://books.google.co.uk/books?id=kC5oQgAACAAJ \|ref=harv \|title=Comet \|isbn=9780747276647 \|author1=Sagan \|first1=Carl \|authorlink1=Carl Sagan \|authorlink2=Ann Druyan \|last2=Druyan \|first2=Ann \|year=1997}} ==Bacaan lebih lanjut== * {{cite book \|last=Schechner \|first=S. J. \|title=Comets, Popular Culture, and the Birth of Modern Cosmology \|publisher=[[Princeton University Press]] \|year=1997 \|isbn= }}. * Brandt, J.C. and Chapman, R.D.: ''Introduction to comets'', Cambridge University Press 2004

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