Secondary Source

I believe one of the most useful secondary sources are textbooks. Textbooks are always written by a reliable source, such as a teacher or school group. They are secondary sources because they cite primary sources such as pictures and documents. For example, some textbooks have pictures of and excerpts from the Declaration of Independance. Textbooks are also secondary sources because they are reports on actual people, places, and events. One representation of this is stories or accounts of the adventures of Lewis and Clarke. Textbooks are truely secondary sources because of their references to primary sources.