World Bank. (2008). Sustainable land management sourcebook. World Bank.
Dyfyniad Arddull ChicagoWorld Bank. Sustainable Land Management Sourcebook. Washington, DC: World Bank, 2008.
Dyfyniad MLAWorld Bank. Sustainable Land Management Sourcebook. World Bank, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.