Dyfyniad APA

Berwick, G. (2009). Science and Environment,Series 1. TP.HCM: NXB tổng hợp.

Dyfyniad Arddull Chicago

Berwick, Gwen. Science and Environment,Series 1. TP.HCM: NXB tổng hợp, 2009.

Dyfyniad MLA

Berwick, Gwen. Science and Environment,Series 1. TP.HCM: NXB tổng hợp, 2009.

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