Ellis, A. K. (1986). Teaching and learning elementary social studies (3rd ed.). Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Ellis, Arthur K. Teaching and Learning Elementary Social Studies. 3rd ed. Boston: Allyn and Bacon, 1986.
Lua MLA (9ú heag.)Ellis, Arthur K. Teaching and Learning Elementary Social Studies. 3rd ed. Allyn and Bacon, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.