Douglas, David. William the Conqueror : The Norman Impact upon England. University of California Press 2008? Softcover. Very Good More recent edition, same cover. Octavo 476 pp

"In William the Conqueror, Professor Douglas analyzes the causes and the true character of the Norman impact upon England in the eleventh century. The work is both a study of Anglo-Norman history and a biography of a man whose personal career was spectacular, and as reviewers have remarked, it is distinguished by a wealth of scholarship linked to a lucid and agreeable style."