Primary sources are those accounts recorded from people who witnessed or participated in the event themselves; these sources include journals, letters, and oral history recordings.

6 Free Online Resources for Primary Source Documents

http://www.edutopia.org/blog/online-resources-primary-source-documents-monica-burns

Cal State University Library – Primary Sources on the Web

http://web.calstatela.edu/library/guides/psweb.htm

University of California Berkeley Library

http://www.lib.berkeley.edu/instruct/guides/primarysourcesontheweb.html

Secondary sources are those written by others based on primary sources and the opinion of scholars past and present.