Dyfyniad APA

Hammer, D. A. (1991). Creating freshwater wetlands. Lewis Publishers.

Dyfyniad Arddull Chicago

Hammer, Donald A. Creating Freshwater Wetlands. London: Lewis Publishers, 1991.

Dyfyniad MLA

Hammer, Donald A. Creating Freshwater Wetlands. Lewis Publishers, 1991.

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