James Graham-Campbell & Gareth Williams 
Silver Economy in the Viking Age [PDF ebook] 

In this book contributions by archaeologists and numismatists from six countries address different aspects of how silver was used in both Scandinavia and the wider Viking world during the 8th to 11th centuries AD. The volume brings together a combination of recent summaries and new work on silver and gold coinage, rings and bullion, which allow a better appreciation of the broader socioeconomic conditions of the Viking world. This is an indispensable source for all archaeologists, historians and numismatists involved in Viking Studies.