Secondary sources interpret and analyze primary sources and are one or more steps removed from the event that is being reported. Examples include journal articles, which interpret or review previous findings; textbooks, criticisms; encyclopedias; commentaries.
A digital archive collection of over 600 core scholarly journals in the arts, humanities, social sciences, business, basic science, life sciences, and physical and applied sciences. Often starts with the first issues (many of which date from the 1800s).