Friedman, F. (2003). Practical guide to environmental management (9th ed.). Washington, D.C.: Environmental Law Institute.
Dyfyniad Arddull ChicagoFriedman, Frank. Practical Guide to Environmental Management. 9th ed. Washington, D.C.: Environmental Law Institute, 2003.
Dyfyniad MLAFriedman, Frank. Practical Guide to Environmental Management. 9th ed. Washington, D.C.: Environmental Law Institute, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.