Chorley, R. J. (1973). Directions in geography. Methuen.
Lua i Stíl Chicago (17ú heag.)Chorley, Richard J. Directions in Geography. London: Methuen, 1973.
Lua MLA (9ú heag.)Chorley, Richard J. Directions in Geography. Methuen, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.