JSTOR is a digital library of academic content in many formats and disciplines. The collections include top peer-reviewed scholarly journals as well as respected literary journals, academic monographs, research reports from trusted institutes, and primary sources. JSTOR is part of ITHAKA, a not-for-profit organization that also includes Ithaka S+R and Portico.
"JSTOR isn't Google: Quick tips on searching JSTOR" (4:20; video automatically starts at 0:37) is by JSTOR.