English version

primary source

From Longman Dictionary of Contemporary Englishprimary sourceˌprimary ˈsource noun [countable]  a document, book etc that contains information that has been obtained from people’s experiences and not taken from other documents, books etcsecondary source
Examples from the Corpus
primary sourceTobacco has collapsed as a primary source of funds.Playing basketball has never been his primary source of income.The research involves the use of primary source materials in national and local archives.For these reasons it is often difficult in many cases to trace a single primary source.The radio is the primary source of information and link to the outside world.Moreover, they saw their primary source of leverage-financial rewards-as less effective with the big producer.
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