Tolong jelaskan mengenai Sumber dari Wasiat Charlemagne

Turner, Samuel Epes (Translator), Einhard: The Life of Charlemagne, Harper & Brothers, New York,  1880, reprinted by the University of Michigan Press in 1960 with a copyrighted forward by Sidney Painter

Thorpe, Lewis G. M., Two Lives of Charlemagne, Penguin, 1969