APA (7th ed.) Citation

Gunnarsson, G. The Sworn Brothers: A Tale of the Early Days of Iceland.

Chicago Style (17th ed.) Citation

Gunnarsson, Gunnar. The Sworn Brothers: A Tale of the Early Days of Iceland.

MLA (9th ed.) Citation

Gunnarsson, Gunnar. The Sworn Brothers: A Tale of the Early Days of Iceland.

Warning: These citations may not always be 100% accurate.