Diagram that explains Primary, Secondary, and Tertiary Sources, as well as how they relate to Publishing and Research.
Primary sources are materials that document the event when it happened—or as close to when it happened as possible.
Examples include:
News: newspapers, magazines, blogs, social media
Government publications and official documents
First person accounts: diaries, letters, oral histories, blogs, social media
A guide to online primary source resources in every subject area.
For further information on Government Information as a primary source, check out the page of this guide titled, "Finding Government Information" from the tabs at the top of the guide.
As a teaser, here's the link to the National Archives (US):