Lenon, B. J., & Cleves, P. G. (1984). Techniques and fieldwork in geography. University Tutorial Press.
Lua i Stíl Chicago (17ú heag.)Lenon, Barnaby J., agus Paul G. Cleves. Techniques and Fieldwork in Geography. Slough: University Tutorial Press, 1984.
Lua MLA (8ú heag.)Lenon, Barnaby J., agus Paul G. Cleves. Techniques and Fieldwork in Geography. University Tutorial Press, 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.