Blaikie, P., .Brookfield, H. C., Allen, B., Crittenden, R., & Clarke, W. (1987). Land degradation and society. Methuen.
Lua i Stíl Chicago (17ú heag.)Blaikie, Piers, H. C. .Brookfield, Bryant Allen, Robert Crittenden, agus William Clarke. Land Degradation and Society. London ; New York: Methuen, 1987.
Lua MLA (9ú heag.)Blaikie, Piers, et al. Land Degradation and Society. Methuen, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.