Davis, J. E., & Fernlund, P. M. (2009). Civics and economics. Pearson/Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Davis, James E., agus Phyllis Maxey Fernlund. Civics and Economics. Needham, MA: Pearson/Prentice Hall, 2009.
Lua MLA (8ú heag.)Davis, James E., agus Phyllis Maxey Fernlund. Civics and Economics. Pearson/Prentice Hall, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.