Dyfyniad APA

Gribbin, J. (1993). In the Beginning: The birth of the living universe. Penguin Books.

Dyfyniad Arddull Chicago

Gribbin, John. In the Beginning: The Birth of the Living Universe. London: Penguin Books, 1993.

Dyfyniad MLA

Gribbin, John. In the Beginning: The Birth of the Living Universe. Penguin Books, 1993.

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