Feder, B. (1968). Viewpoints in world history (Teacher's ed.). American Book Co..
Lua i Stíl Chicago (17ú heag.)Feder, Bernard. Viewpoints in World History. Teacher's ed. New York ; Cincinnati [etc.]: American Book Co., 1968.
Lua MLA (8ú heag.)Feder, Bernard. Viewpoints in World History. Teacher's ed. American Book Co., 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.