Primary sources are the original materials. A primary source also called original source and examples for primary sources are artifact, a document, a recording, or other source of information created while doing study. Journalism is a primary source that could be a person with direct knowledge of a situation, or the document created by the person.
Secondary sources had been generalized, analyzed, synthesized, interpreted, or evaluated from the original information. Secondary sources are not an evidence, instead it is comment or discussion on an evidence. The example of secondary sources are bibliography, jounal articles, dissertations, commentaries, abstracts, monographs and indexes.
http://en.wikipedia.org/wiki/Secondary_source
An even higher sources is the tertiary sources which is a distillation and collection from the primary and secondary sources. The encyclopedia or dictionary resemble the secondary souce in that it had analysis as well but it provide a broad overview of the introductory of a topic. http://en.wikipedia.org/wiki/Secondary_source
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