Trade in the Viking Age, Trade routes
Celts vs Vikings — An overall comparison, by Tahmid Munim Hossain
The Secret History of the Vikings
Trade History: Vikings make deals to bring in several all-time greats — Inside The Hashes
Vikings: Raiding and Trading in the Middle Ages - Serious Science
Viking Exploration - Australian National Maritime Museum
The Vikings in Britain: a brief history / Historical Association
The Viking Raid on Lindisfarne - Life in Norway
The Viking Economy: Trade in the Viking Age