Scott, Foresman and Company, & Boyd, C. D. (2003). Regions: Scott, Foresman social studies. Pearson Education, Inc..
Lua i Stíl Chicago (17ú heag.)Scott, Foresman and Company, agus Candy Dawson Boyd. Regions: Scott, Foresman Social Studies. Glenview, Ill.: Pearson Education, Inc., 2003.
Lua MLA (8ú heag.)Scott, Foresman and Company, agus Candy Dawson Boyd. Regions: Scott, Foresman Social Studies. Pearson Education, Inc., 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.