Dyfyniad APA

(1974). Science Year: The world book science annual 1975. Chicago, Illinois: Field Enterprises Educational Corporation.

Dyfyniad Arddull Chicago

Science Year: The World Book Science Annual 1975. Chicago, Illinois: Field Enterprises Educational Corporation, 1974.

Dyfyniad MLA

Science Year: The World Book Science Annual 1975. Chicago, Illinois: Field Enterprises Educational Corporation, 1974.

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