McKinley, A. E., Howland, A. C., & Dann, M. L. (1939). World history today. American Book Co..
Lua i Stíl Chicago (17ú heag.)McKinley, Albert E., Arthur C. Howland, agus Matthew Lincoln Dann. World History Today. New York ; Cincinnati [etc.]: American Book Co., 1939.
Lua MLA (8ú heag.)McKinley, Albert E., et al. World History Today. American Book Co., 1939.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.