Dyfyniad APA

(1993). Mcgraw-hill Encyclopedia Of Environmental Science & Engineering Editors In Chief: Sybil P.parker, Robert A. Carbitt. McGraw-Hill.

Dyfyniad Arddull Chicago

Mcgraw-hill Encyclopedia Of Environmental Science & Engineering Editors In Chief: Sybil P.parker, Robert A. Carbitt. McGraw-Hill, 1993.

Dyfyniad MLA

Mcgraw-hill Encyclopedia Of Environmental Science & Engineering Editors In Chief: Sybil P.parker, Robert A. Carbitt. McGraw-Hill, 1993.

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