Dyfyniad APA

ebrary, Inc, & Carlsen, W. S. (2004). Watershed dynamics (Teacher ed.). National Science Teachers Association.

Dyfyniad Arddull Chicago

ebrary, Inc, and William S. Carlsen. Watershed Dynamics. Teacher ed. Arlington, Va.: National Science Teachers Association, 2004.

Dyfyniad MLA

ebrary, Inc, and William S. Carlsen. Watershed Dynamics. Teacher ed. National Science Teachers Association, 2004.

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