Existing Sources
While some sociologists spend time in the field conducting surveys or observing participants, others spend most of their research time in libraries, using existing sources for their research.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Bemowo library books."
http://commons.wikimedia.org/wiki/File:Bemowo_library_books.jpg
Wikimedia
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