Dyfyniad APA

Hawking, S., & Mlodinow, L. (2008). A Brief History of Time. Bantam Press.

Dyfyniad Arddull Chicago

Hawking, Stephen, and Leonard Mlodinow. A Brief History of Time. London: Bantam Press, 2008.

Dyfyniad MLA

Hawking, Stephen, and Leonard Mlodinow. A Brief History of Time. Bantam Press, 2008.

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