Dyfyniad APA

Enger, E., & Smith, B. (1995). Pollution and policy. McGraw-Hill.

Dyfyniad Arddull Chicago

Enger, Eldon, and Bradley Smith. Pollution and Policy. Boston: McGraw-Hill, 1995.

Dyfyniad MLA

Enger, Eldon, and Bradley Smith. Pollution and Policy. McGraw-Hill, 1995.

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