Dyfyniad APA

Birch, B. (1991). Alexander Fleming. Replicação.

Dyfyniad Arddull Chicago

Birch, Beverley. Alexander Fleming. Replicação, 1991.

Dyfyniad MLA

Birch, Beverley. Alexander Fleming. Replicação, 1991.

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