Dyfyniad APA
Varallo, A. (2005). This day in history. University of Iowa Press.
Dyfyniad Arddull Chicago
Varallo, Anthony. This Day in History. Iowa City, IA: University of Iowa Press, 2005.
Dyfyniad MLA
Varallo, Anthony. This Day in History. University of Iowa Press, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.