Cartledge, B. (1992). Monitoring the environment. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Cartledge, Bryan. Monitoring the Environment. Oxford ; New York: Oxford University Press, 1992.
Lua MLA (8ú heag.)Cartledge, Bryan. Monitoring the Environment. Oxford University Press, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.