They have retired but their website is full of helpful information on varieties and growing information.
GOURMET GARLIC GARDEN
Everything you want to know about garlic in their Garlic 101 section.
RASA CREEK FARM
Garlic growing information including workshops and books.
SCAPES 1 WATERCOLOUR
By Kathleen Slavin 2018
ORIGIN AND HISTORY OF GARLIC
"Garlic has been revered as an offering fit for the gods and despised as a substance suitable only to be fed to hogs. For over 5,000 years garlic has been used as food, medicine, an aphrodisiac, money, and magic potions."