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Baris 47: == Pranala luar == * {{citation \| last1 = Kennedy \| first1 = Donald \| last2 = Norman \| first2 = Colin \| year = 2005 \| title = What Don't We Know? \| journal = Science \| volume = 309 \| issue = 5731 \| pages = 75–75 \| doi = 10.1126/science.309.5731.75 \| url = http://www.sciencesignaling.org/cgi/content/summary/sci;309/5731/75 \| pmid = 15994521 }}{{Pranala mati\|date=Desember 2021 \|bot=InternetArchiveBot \|fix-attempted=yes }} * {{cite journal \|author= \|title=So much more to know \|journal=Science (journal) \|volume=309 \|issue=5731 \|pages=78–102 \|year=2005 \|month=Juli \|pmid=15994524 \|doi=10.1126/science.309.5731.78b}}

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