Dyfyniad APA

Hawking, S., & Runger, N. (1988). A brief history of time. Bantam Books.

Dyfyniad Arddull Chicago

Hawking, Stephen, and Nelson Runger. A Brief History of Time. Toronto: Bantam Books, 1988.

Dyfyniad MLA

Hawking, Stephen, and Nelson Runger. A Brief History of Time. Bantam Books, 1988.

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