Madame du Barry: The Wages of Beauty by Joan Haslip
A brief and sympathetic biography of the infamous last mistress of Louis XV. This work is best used as a character study of du Barry, rather than a strict resource on her life, as Haslip has a tendency to fudge dates/events and does not cite her work.
Du Barry: A Biography by Stanley Loomis
A sympathetic biography of Jeanne Bécu, the comtesse du Barry, which primarily hopes to correct some of the myths and misconceptions about the life of this infamous courtesan. Although Loomis is definitely biased in favor of Madame du Barry, his work on her life is more reliable than the other readly available English biography by Haslip.