Beyond the Index - Michael John Neill. This article analyses a 1920s era death certificate and discusses additional sources and records that should be accessed based upon what information is contained in the death record.
The Anatomy of a Death Record Legacy QuickGuide™ by Cari A. Taplin contains valuable information on how to interpret the data in a variety of death records including death certificates and death registers. This handy 5-page PDF guide can be used on your computer or mobile device for anytime access.
From the National Center for Health Statistics. Aimed primarily at medical examiners who write the statements, the tutorials on this site also gives the genealogist some idea of typical problems faced with interpreting a cause of death statement on a death certificate.