Dyfyniad APA

Davis, K. C. (2001). Don't know much about the Universe. New York: Random House.

Dyfyniad Arddull Chicago

Davis, Kenneth C. Don't Know Much About the Universe. New York: Random House, 2001.

Dyfyniad MLA

Davis, Kenneth C. Don't Know Much About the Universe. New York: Random House, 2001.

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