Dyfyniad APA

Andrews,William A, & McEwan,Sandra J. (1987). Investigating Aquatic Ecosystems. Prentice-Hall.

Dyfyniad Arddull Chicago

Andrews,William A, and McEwan,Sandra J. Investigating Aquatic Ecosystems. Ontario: Prentice-Hall, 1987.

Dyfyniad MLA

Andrews,William A, and McEwan,Sandra J. Investigating Aquatic Ecosystems. Prentice-Hall, 1987.

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