Dyfyniad APA

White, M. . .., & Gribbin, J. . .. (1993). Stephen Hawking: A life in science. Penguin Books.

Dyfyniad Arddull Chicago

White, Michael ., and John Gribbin. Stephen Hawking: A Life in Science. Midlesex: Penguin Books, 1993.

Dyfyniad MLA

White, Michael ., and John Gribbin. Stephen Hawking: A Life in Science. Penguin Books, 1993.

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