» Onion Production Guide 
- A comprehensive guide for onion production from the University of Georgia. [PDF]
» Allium cepa (Onion) - Plants for a Future: description, botanic details, cultivation, uses, range.
» Allium cepa proliferum (Tree Onion) - Description, botanic details, cultivation, uses, and range.
» Gernot Katzer's Spice Dictionary: Onions - Onion's main constituents, origin, ethymology, and how it is used for cooking around the world.
» Green Onions - Guide for producing commercial green onions. University of Georgia.
» History and Origin of the Onion - Describes the origins of the Vidalia onion in Toombs County, Georgia and provides a history of onions from ancient Egypt to modern times.
» Onion and Garlic Research at the University of Liverpool - Research into flavor of Alliums using biochemical and molecular genetic methods, led by Dr. Hamish A. Collin and Dr. Meriel G. Jones.
» Onion and Its Relatives - Articles about cultivated onions from Purdue University.
» Onions and Related Species - Cultivating onions: fertility, planting, pest control, storage, varieties.
