A Primary Source is a document, record, or work created at the time of an event or by a person who directly experienced an event. A Primary Source contains original data and is from the time period being researched; it has not yet been filtered through interpretation.
University of Maryland Libaries. (2013). Primary, Secondary and Tertiary Sources. Retrieved from http://www.lib.umd.edu/ues/guides/primary-sources#primary
University of Victoria Libraries. (2013). Primary or Secondary Sources. Retrieved from http://www.uvic.ca/library/research/tips/primvsec/index.php
*The above references are in APA format.
Internet Modern History Sourcebook
Cuba - LANIC - Latin American Network Information Center - Excellent selection of links to a variety of primary and secondary information.