The source list gives an early indication of what supports a book's analysis. Primary sources include contemporary accounts by people at the events and government records compiled from those close to them. They remain one step removed from the event itself, yet they connect the author to firsthand information. A strong primary-source base therefore helps a reader see how directly the argument rests on contemporary evidence. It also leaves the author's own analysis visible instead of filtering it through earlier historians' interpretations.
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Primary sources reveal an argument's foundation
A source list rich in contemporary testimony and official records shows how closely a historian's argument rests on the events and people involved.