BrickLink - Set 7021-1 : LEGO Viking Double Catapult vs. the Armoured Ofnir Dragon [Vikings] - BrickLink Reference Catalog
A look back at the "Vikings" Theme — Brickset Forum
Viking Fortress against the Fafnir Dragon 7019 - LEGO® Vikings - Building Instructions - Customer Service - LEGO.com US
Vikings | Brickset: LEGO set guide and database
Vikings Wolf LEGO - Vikings (7015) - from Sort It Apps
The History of the Vikings: Norse Sagas, Medieval Marauders, and Far-Flung Settlements (Audible Audio Edition): Chris R. Fee, Chris R. Fee, Learn25: Books - Amazon.com
Peeron: Viking Warrior challenges the Fenris Wolf (#7015-1)
Vikings | Brickset: LEGO set guide and database
Amazon.com: Building Toys - Lego Vikings / Building Toys: Toys & Games