Dyfyniad APA

Ahern, C. (2009). The book of tomorrow. Harper Collins.

Dyfyniad Arddull Chicago

Ahern, Cecelia. The Book of Tomorrow. London: Harper Collins, 2009.

Dyfyniad MLA

Ahern, Cecelia. The Book of Tomorrow. Harper Collins, 2009.

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