Dyfyniad APA

Hawking, S. (1993). Black holes and baby universes and other essays. Bantam Books.

Dyfyniad Arddull Chicago

Hawking, Stephen. Black Holes and Baby Universes and Other Essays. New York, N.Y: Bantam Books, 1993.

Dyfyniad MLA

Hawking, Stephen. Black Holes and Baby Universes and Other Essays. Bantam Books, 1993.

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