R. Paul Butler (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "R. Paul Butler" in Polish language version.

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carnegiescience.edu (Global: low place; Polish: low place)

R. Paul Butler Staff Scientist. Carnegie Institution for Science. [dostęp 2014-07-16]. (ang.).

Henry Draper Medal. National Academy of Sciences, 2014. [dostęp 2016-03-13]. (ang.).

Dennis Overbye: Finder of New Worlds. [w:] The New York Times [on-line]. 2014-05-12. [dostęp 2014-07-16]. (ang.).

Sara Goudarzi: Five Out of Five Researchers Agree: Earth’s Solar System Special. Space.com, 2005-03-31. [dostęp 2014-07-16]. (ang.).