Dyfyniad APA

 Siegel, M. (2006).  Bird flu: Everything you need to know about the next pandemic.  John Wiley & Sons.

Dyfyniad Arddull Chicago

 Siegel, Marc.  Bird Flu: Everything You Need to Know About the Next Pandemic.  John Wiley & Sons, 2006.

Dyfyniad MLA

 Siegel, Marc.  Bird Flu: Everything You Need to Know About the Next Pandemic.  John Wiley & Sons, 2006.

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