Parsed documentation:
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source (http://purl.org/dc/terms/source)

@return [String]
Source reference for this distribution record. Can be proper publication
citation, a webpage URL, etc.

Example: "Euro+Med Plantbase - the information resource for 
Euro-Mediterranean plant diversity (2006-). Published on the Internet
http://ww2.bgbm.org/EuroPlusMed/ July, 2009"
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