Klein, S. (1983). Our world today. Steck-Vaughn.
Lua i Stíl Chicago (17ú heag.)Klein, Stanley. Our World Today. Steck-Vaughn, 1983.
Lua MLA (9ú heag.)Klein, Stanley. Our World Today. Steck-Vaughn, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.