WHAT IS A SECONDARY SOURCE? - A secondary source is a source that was dated after the event. These can included photos, videos, perspective and etc.Mainly is accounted first handed.
"A broadside on the Boston Massacre (Massachusetts Historical Society, Boston."American Eras. Vol. 3: The Revolutionary Era, 1754-1783. Detroit: Gale, 1997. U.S. History in Context. Web. 30 Sept. 2014.
"Boston Massacre." The American Revolution. Woodbridge, CT: Primary Source Media, 1999. American Journey. U.S. History in Context. Web. 30 Sept. 2014.
"Large numbers of American colonists were convinced that the Boston Massacre was caused by..." American Revolution Reference Library. Ed. Barbara Bigelow, Stacy A. McConnell, and Linda Schmittroth. Vol. 3: Almanac. Detroit: UXL, 2000. U.S. History in Context. Web. 30 Sept. 2014.