Easton, S. C. (1971). A survey of ancient, medieval and modern history. National Bookstore.
Lua i Stíl Chicago (17ú heag.)Easton, Stewart Copinger. A Survey of Ancient, Medieval and Modern History. Manila: National Bookstore, 1971.
Lua MLA (9ú heag.)Easton, Stewart Copinger. A Survey of Ancient, Medieval and Modern History. National Bookstore, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.