Radder, H. (2006). The world observed, the world conceived. University of Pittsburgh Press.
Lua i Stíl Chicago (17ú heag.)Radder, Hans. The World Observed, the World Conceived. Pittsburgh, Pennsylvania: University of Pittsburgh Press, 2006.
Lua MLA (9ú heag.)Radder, Hans. The World Observed, the World Conceived. University of Pittsburgh Press, 2006.
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