Dyfyniad APA

(1977). Science: American association for the advancement of science. Washington.

Dyfyniad Arddull Chicago

Science: American Association for the Advancement of Science. Washington, 1977.

Dyfyniad MLA

Science: American Association for the Advancement of Science. Washington, 1977.

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