Johnston, R. (1985). Future of geography. Methuen.
Lua i Stíl Chicago (17ú heag.)Johnston, R.J. Future of Geography. London: Methuen, 1985.
Lua MLA (9ú heag.)Johnston, R.J. Future of Geography. Methuen, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.