University of California
Uc Irvine: Distinguishing Between Primary & Secondary Sources
This site has an online quiz to test your knowledge of primary and secondary sources.
TES Global
Blendspace: Primary & Secondary Sources
A twelve-part learning module with links to texts, videos, quizzes, images, and websites to use while learning about primary and secondary research sources.
Harry S. Truman Library and Museum
Truman Library & Museum: Incorporating Primary Sources in the Classroom
Students and teachers are given direction in how to work with the primary source materials of the Harry S Truman Presidential Library.
Energy for Sustainable Development
Esd Bulgaria: Kids & Energy: Energy Timelines: Electricity
A brief history of electricity, a secondary energy source that is produced by converting primary energy sources, such as oil or nuclear power.