National Center for Home Food Preservation –
How Do I Making Jams and Jellies?
University of Clemson Extension – Basics of Jelly Making
NCSU Cooperative Extension - Jams & Jellies
University of Missouri Extension - Jam and Jelly Basics
North Dakota State University Extension Service - Jams and Jellies
Ohio State University Extension - Jams, Jellies, and Other Fruit Spreads