Dyfyniad APA

Blaikie, P., .Brookfield, H. C., Allen, B., Crittenden, R., & Clarke, W. (1987). Land degradation and society. Methuen.

Dyfyniad Arddull Chicago

Blaikie, Piers, H. C. .Brookfield, Bryant Allen, Robert Crittenden, and William Clarke. Land Degradation and Society. London ; New York: Methuen, 1987.

Dyfyniad MLA

Blaikie, Piers, et al. Land Degradation and Society. Methuen, 1987.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.