Dyfyniad APA

Alexander, W., & Street, A. (1976). Metals in the Service of Man (6th ed.). Penguin Books.

Dyfyniad Arddull Chicago

Alexander, William, and Arthur Street. Metals in the Service of Man. 6th ed. England: Penguin Books, 1976.

Dyfyniad MLA

Alexander, William, and Arthur Street. Metals in the Service of Man. 6th ed. Penguin Books, 1976.

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