1. The Vanishing Square: Civic Learning in the Internet Age;Levinson M.;Democracy in Crisis: Civic Learning and the Reconstruction of Common Purpose,2021
2. Pennsylvania Department of Education Academic Standards for Science and Technology 2002 https://www.stateboard.education.pa.gov/Documents/Regulations%20and%20Statements/State%20Academic%20Standards/ScienceandTechnologyStandards.pdf.
3. Civic Learning When the Facts Are Politicized: How Values Shape Facts, and What to Do about It;Kaebnick G. E.;Democracy in Crisis: Civic Learning and the Reconstruction of Common Purpose,2021