Boffinology

Ragnar Lothbrok: The Tale of a Viking Warrior King

Charge!: The Interesting Bits of Military History

Northmen: The Viking Saga, 793–1241 AD

The Legend of Ragnar Lodbrok: Viking King and Warrior

The Interesting Bits

Vikings at War

Secret Britain: The Hidden Bits of Our History

The Saga of the Volsungs: With the Saga of Ragnar Lothbrok

The Age of the Vikings

Norse Mythology: A Concise Guide to Gods, Heroes, Sagas and Beliefs of Norse Mythology

Ibn Fadlan and the Land of Darkness: Arab Travellers in the Far North

Njal's Saga

Norse Myths: Viking Legends of Heroes and Gods

The Vikings: A Very Short Introduction

Vikings: Ragnar Lodbrok and the Women Who Loved Him

Sketches in Holland and Scandinavia

The Northmen's Fury: A History of the Viking World

Folklore Fights the Nazis: Humor in Occupied Norway, 1940–1945