Dyfyniad APA

American Association for the Advancement of Science. (2001). Science. s.e.

Dyfyniad Arddull Chicago

American Association for the Advancement of Science. Science. Massachusetts: s.e, 2001.

Dyfyniad MLA

American Association for the Advancement of Science. Science. s.e, 2001.

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