Butlin, R. A. (1993). Historical geography: Through the gates of space and time. E. Arnold.
Lua i Stíl Chicago (17ú heag.)Butlin, R. A. Historical Geography: Through the Gates of Space and Time. London: E. Arnold, 1993.
Lua MLA (9ú heag.)Butlin, R. A. Historical Geography: Through the Gates of Space and Time. E. Arnold, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.