Haddock, B. A. (1980). An introduction to historical thought. E. Arnold.
Lua i Stíl Chicago (17ú heag.)Haddock, B. A. An Introduction to Historical Thought. London: E. Arnold, 1980.
Lua MLA (8ú heag.)Haddock, B. A. An Introduction to Historical Thought. E. Arnold, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.