Books:

1. Bell, R.C., "Board and Table Games from Many Civilizations" - Volume 1 & 2, Dover Publications Inc. New York, 1979

2. Murray, H.J.R., "A History of Board-Games other than Chess", Oxford University Press, 1951

3. Murray, H.J.R., "A History of Chess", Oxford University Press, 1913

4. Schützeichel, R., "Althochdeutsches Wörterbuch", 5. Auflage, Max Niemeyer Verlag Tübingen, 1995

5. Wenz, G., "Die Geschichte von Frithiof dem Kühnen" , Eugen Diederichs Verlag Jena, 1922