Dyfyniad APA

BLASHFIELD, J. &. B. (1991). OIL SPILLS. CHILDRENS PRESS.

Dyfyniad Arddull Chicago

BLASHFIELD, JEAN.F & BLACK. OIL SPILLS. USA: CHILDRENS PRESS, 1991.

Dyfyniad MLA

BLASHFIELD, JEAN.F & BLACK. OIL SPILLS. CHILDRENS PRESS, 1991.

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