McKay, J. P., & Hill, B. D. (1987). A history of world societies (3rd ed.). Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)McKay, John P., agus Bennett D. Hill. A History of World Societies. 3rd ed. Dallas: Houghton Mifflin, 1987.
Lua MLA (9ú heag.)McKay, John P., agus Bennett D. Hill. A History of World Societies. 3rd ed. Houghton Mifflin, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.